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Setting Up a Koji Build System

The Koji components may live on separate resources as long as all resources are able to communicate. This document will cover how to setup each service individually, however, all services may live on the same resource.


Knowledge Prerequisites

  • Basic understanding of SSL and authentication via certificates and/or Kerberos credentials
  • Basic knowledge about creating a database in PostgreSQL and importing a schema
  • Working with psql
  • Basic knowledge about Apache configuration
  • Basic knowledge about yum/createrepo/mock - else you'll not be able to debug problems!
  • Basic knowledge about using command line
  • Basic knowledge about RPM building
  • Simple usage of the Koji client
  • For an overview of yum, mock, Koji (and all its subcomponents), mash, and how they all work together, see the excellent slides put together by Steve Traylen at CERN [1].

Package Prerequisites

On the server (koji-hub/koji-web)

  • httpd
  • mod_ssl
  • postgresql-server
  • mod_wsgi

On the builder (koji-builder)

  • mock
  • setarch (for some archs you'll require a patched version)
  • rpm-build
  • createrepo

A note on filesystem space

Koji will consume copious amounts of disk space under the primary KojiDir directory (as set in the kojihub.conf file - defaults to /mnt/koji). However, as koji makes use of mock on the backend to actually create build roots and perform the builds in those build roots, it might come to a surprise to users that a running koji server will consume large amounts of disk space under /var/lib/mock and /var/cache/mock as well. Users should either plan the disk and filesystem allocations for this, or plan to modify the default mock build directory in the kojid.conf file. If you change the location, ensure that the new directories are owned by the group "mock" and have 02755 permission.

Koji Authentication Selection

Koji primarily supports Kerberos and SSL Certificate authentication. For basic koji command line access, plain user/pass combinations are possible. However, kojiweb does not support plain user/pass authentication and once either Kerberos or SSL Certificate authentication is enabled for kojiweb, the plain user/pass method will stop working entirely. For this reason we encourage skipping the plain user/pass method altogether and properly configuring either Kerberos or SSL Certification authentication from the start.

The decision on how to authenticate users will affect all other actions you take in setting up koji. For this reason it is a decision best made up front.

For Kerberos authentication, a working Kerberos environment (the user is assumed to either already have this or know how to set it up themselves, instructions for it are not included here) and the Kerberos credentials of the initial admin user will be necessary to bootstrap the user database.

For SSL authentication, SSL certificates for the xmlrpc server, for the various koji components, and one for the admin user will need to be setup (the user need not know how to create certificate chains already, we include the instructions for this below).

Setting up SSL Certificates for authentication

Certificate generation

  • Create the /etc/pki/koji directory and copy-and-paste the ssl.cnf listed here, and save it in the new directory. This configuration file is used along with the openssl command to generate the SSL certificates for the various koji components.


HOME                    = .
RANDFILE                = .rand

default_ca              = ca_default

dir                     = .
certs                   = $dir/certs
crl_dir                 = $dir/crl
database                = $dir/index.txt
new_certs_dir           = $dir/newcerts
certificate             = $dir/%s_ca_cert.pem
private_key             = $dir/private/%s_ca_key.pem
serial                  = $dir/serial
crl                     = $dir/crl.pem
x509_extensions         = usr_cert
name_opt                = ca_default
cert_opt                = ca_default
default_days            = 3650
default_crl_days        = 30
default_md              = md5
preserve                = no
policy                  = policy_match

countryName             = match
stateOrProvinceName     = match
organizationName        = match
organizationalUnitName  = optional
commonName              = supplied
emailAddress            = optional

default_bits            = 1024
default_keyfile         = privkey.pem
distinguished_name      = req_distinguished_name
attributes              = req_attributes
x509_extensions         = v3_ca # The extentions to add to the self signed cert
string_mask             = MASK:0x2002

countryName                     = Country Name (2 letter code)
countryName_default             = AT
countryName_min                 = 2
countryName_max                 = 2
stateOrProvinceName             = State or Province Name (full name)
stateOrProvinceName_default     = Vienna
localityName                    = Locality Name (eg, city)
localityName_default            = Vienna
0.organizationName              = Organization Name (eg, company)
0.organizationName_default      = My company
organizationalUnitName          = Organizational Unit Name (eg, section)
commonName                      = Common Name (eg, your name or your server\'s hostname)
commonName_max                  = 64
emailAddress                    = Email Address
emailAddress_max                = 64

challengePassword               = A challenge password
challengePassword_min           = 4
challengePassword_max           = 20
unstructuredName                = An optional company name

basicConstraints                = CA:FALSE
nsComment                       = "OpenSSL Generated Certificate"
subjectKeyIdentifier            = hash
authorityKeyIdentifier          = keyid,issuer:always

subjectKeyIdentifier            = hash
authorityKeyIdentifier          = keyid:always,issuer:always
basicConstraints                = CA:true

Although it is not required, it is recommended that you edit the default values in the [req_distinguished_name] section of the configuration to match the information for your own server. This will allow you to accept most of the default values when generating certificates later. The other sections can be left unedited.

Generate CA

The CA is the Certificate Authority. It's the key/cert pair used to sign all the other certificate requests. When configuring the various koji components, both the client CA and the server CA will be a copy of the CA generated here. The CA certificate will be placed in the /etc/pki/koji directory and the certificates for the other components will be placed in the /etc/pki/koji/certs directory. The index.txt file which is created is a database of the certificates generated and can be used to view the information for any of the certificates simply by viewing the contents of index.txt.

cd /etc/pki/koji/
mkdir {certs,private,confs}
touch index.txt
echo 01 > serial
openssl genrsa -out private/koji_ca_cert.key 2048
openssl req -config ssl.cnf -new -x509 -days 3650 -key private/koji_ca_cert.key \
-out koji_ca_cert.crt -extensions v3_ca

The last command above will ask you to confirm a number of items about the certificate you are generating. Presumably you already edited the defaults for the country, state/province, locale, and organization in the ssl.cnf file and you only needed to hit enter. It's the organizational unit and the common name that we will be changing in the various certs we create. For the CA itself, these fields don't have a hard requirement. One suggestion for this certificate is to use the FQDN of the server.

If you are trying to automate this process via a configuration management tool, you can create the cert in one command with a line like this:

openssl req -config ssl.cnf -new -x509 \
-subj "/C=US/ST=Oregon/L=Portland/O=IT/CN=koji.example.com" \
-days 3650 -key private/koji_ca_cert.key -out koji_ca_cert.crt -extensions v3_ca

Generate the koji component certificates and the admin certificate

Each koji component needs its own certificate to identify it. Two of the certificates (kojihub and kojiweb) are used as server side certificates that authenticate the server to the client. For this reason, you want the common name on both of those certs to be the fully qualified domain name of the web server they are running on so that clients don't complain about the common name and the server not being the same. You can set the OU for these two certificates to be kojihub and kojiweb for identification purposes.

For the other certificates (kojira, kojid, the initial admin account, and all user certificates), the cert is used to authenticate the client to the server. The common name for these certs should be set to the login name for that specific component. For example the common name for the kojira cert should be set to kojira so that it matches the username. The reason for this is that the common name of the cert will be matched to the corresponding user name in the koji database. If there is not a username in the database which matches the CN of the cert the client will not be authenticated and access will be denied.

When you later use koji add-host to add a build machine into the koji database, it creates a user account for that host even though the user account doesn't appear in the user list. The user account created must match the common name of the certificate which that component uses to authenticate with the server. When creating the kojiweb certificate, you'll want to remember exactly what values you enter for each field as you'll have to regurgitate those into the /etc/koji-hub/hub.conf file as the ProxyDNs entry.

When you need to create multiple certificates it may be convenient to create a loop or a script like the on listed below and run the script to create the certificates. You can simply adjust the number of kojibuilders and the name of the admin account as you see fit. For much of this guide, the admin account is called "kojiadmin".

#if you change your certificate authority name to something else you will need to change the caname value to reflect the change.

# user is equal to parameter one or the first argument when you actually run the script

openssl genrsa -out certs/${user}.key 2048
cat ssl.cnf | sed 's/insert_hostname/'${user}'/'> ssl2.cnf
openssl req -config ssl2.cnf -new -nodes -out certs/${user}.csr -key certs/${user}.key
openssl ca -config ssl2.cnf -keyfile private/${caname}_ca_cert.key -cert ${caname}_ca_cert.crt \
-out certs/${user}.crt -outdir certs -infiles certs/${user}.csr
cat certs/${user}.crt certs/${user}.key > ${user}.pem
mv ssl2.cnf confs/${user}-ssl.cnf

Generate a PKCS12 user certificate (for web browser) This is only required for user certificates.

openssl pkcs12 -export -inkey certs/${user}.key -in certs/${user}.crt -CAfile ${caname}_ca_cert.crt \
-out certs/${user}_browser_cert.p12

When generating certs for a user, the user will need the ${user}.pem, the ${caname}_ca_cert.crt, and the ${user}_browser_cert.p12 files which were generated above. The ${user}.pem file would normally be installed as ~/.fedora.cert, the ${caname}_ca_cert.crt file would be installed as both ~/.fedora-upload-ca.cert and ~/.fedora-server-ca.cert, and the user would import the ${user}_brower_cert.p12 into their web browser as a personal certificate.

Copy certificates into ~/.koji for kojiadmin

You're going to want to be able to send admin commands to the kojihub. In order to do so, you'll need to use the newly created certificates to authenticate with the hub. Create the kojiadmin user then copy the certificates for the koji CA and the kojiadmin user to ~/.koji:

kojiadmin@localhost$ mkdir ~/.koji
kojiadmin@localhost$ cp /etc/pki/koji/kojiadmin.pem ~/.koji/client.crt   # NOTE: It is IMPORTANT you use the PEM and NOT the CRT
kojiadmin@localhost$ cp /etc/pki/koji/koji_ca_cert.crt ~/.koji/clientca.crt
kojiadmin@localhost$ cp /etc/pki/koji/koji_ca_cert.crt ~/.koji/serverca.crt

Note: See /etc/koji.conf for the current system wide koji client configuration. Copy /etc/koji.conf to ~/.koji/config if you wish to change the config on a per user basis.

Setting up Kerberos for authentication

The initial configuration of a kerberos service is outside the scope of this document, however there are a few specific things required by koji.


The koji builders (kojid) use DNS to find the kerberos servers for any given realm.

_kerberos._udp    IN SRV  10 100 88 kerberos.EXAMPLE.COM.

The trailing dot denotes DNS root and is needed if FQDN is used.

Principals and Keytabs

It should be noted that in general you will need to use the fully qualified domain name of the hosts when generating the keytabs for services.

You will need the following principals extracted to a keytab for a fully kerberized configuration, the requirement for a host key for the koji-hub is currently hard coded into the koji client.

  • host/kojihub@EXAMPLE.COM
    • Used by the koji-hub server when communicating with the koji client
  • HTTP/kojiweb@EXAMPLE.COM
    • Used by the koji-web server when performing a negotiated Kerberos authentication with a web browser. This is a service principal for Apache's mod_auth_kerb.
  • koji/kojiweb@EXAMPLE.COM
    • Used by the koji-web server during communications with the koji-hub. This is a user principal that will authenticate koji-web to Kerberos as "koji/kojiweb@EXAMPLE.COM". Koji-web will proxy the mod_auth_kerb user information to koji-hub (the ProxyPrincipals koji-hub config option).
  • koji/kojira@EXAMPLE.COM
    • Used by the kojira server during communications with the koji-hub
  • compile/builder1@EXAMPLE.COM
    • Used on builder1 to communicate with the koji-hub

PostgreSQL Server

Once the authentication scheme has been setup your will need to install and configure a PostgreSQL server and prime the database which will be used to hold the koji users.

Configuration Files:

  • /var/lib/pgsql/data/pg_hba.conf
  • /var/lib/pgsql/data/postgresql.conf

Install PostgreSQL:

root@localhost$ yum install postgresql-server

Initialize PostgreSQL DB:

The following commands will initialize PostgreSQL and will start the database service

root@localhost$ service postgresql initdb
root@localhost$ service postgresql start
initdb on Fedora 16
The PostgreSQL init script has been converted to systemd in Fedora 16, so the initdb function has been removed. To run initdb directly:
su - postgres -c "PGDATA=/var/lib/pgsql/data initdb"

Setup User Accounts:

The following commands will setup the koji account and assign it a password

root@localhost$ useradd koji
root@localhost$ passwd koji

Setup PostgreSQL and populate schema:

The following commands will:

  • create the koji user within PostgreSQL
  • create the koji database within PostgreSQL
  • set a password for the koji user
  • create the koji schema using the provided /usr/share/doc/koji*/docs/schema.sql file
root@localhost$ su - postgres
postgres@localhost$ createuser koji
Shall the new role be a superuser? (y/n) n
Shall the new role be allowed to create databases? (y/n) n
Shall the new role be allowed to create more new roles? (y/n) n
postgres@localhost$ createdb -O koji koji
postgres@localhost$ psql -c "alter user koji with encrypted password 'mypassword';"
postgres@localhost$ logout
root@localhost$ su - koji
koji@localhost$ psql koji koji < /usr/share/doc/koji*/docs/schema.sql
koji@localhost$ exit

NOTE: When issuing the command to import the psql schema into the new database it is important to ensure that the directory path /usr/share/doc/koji*/docs/schema.sql remains intact and is not resolved to a specific version of koji. In test it was discovered that when the path is resolved to a specific version of koji then not all of the tables were created correctly.

NOTE: When issuing the command to import the psql schema into the new database it is important to ensure that you are logged in as the koji database owner. This will ensure all objects are owned by the koji database user. Upgrades may be difficult if this was not done correctly.

Authorize Koji-web and Koji-hub resources: In this example, Koji-web and Koji-hub are running on localhost.

/var/lib/pgsql/data/pg_hba.conf: These settings need to be valid and inline with other services configurations. Please note, the first matching auth line is used so this line must be above any other potential matches. Add:

host    koji        koji      trust
host    koji        koji     ::1/128          trust

It may also be necessary to add an entry for your machine's external IP address:

host    koji        koji    $IP_ADDRESS/32    trust

You can also use UNIX socket access. The DBHost variable must be unset to use this method. Add:

local   koji        apache                            trust
local   koji        koji                              trust

NOTE: To enforce password based logins to the database, change trust to md5.

host    koji        koji      md5
host    koji        koji     ::1/128          md5
host    koji        koji    $IP_ADDRESS/32    md5

Make auth changes live:

You must reload the PostgreSQL configuration for these changes to become active.

root@localhost$ service postgresql reload

Bootstrapping the initial koji admin user into the PostgreSQL database:

The initial admin user must be manually added to the user database using sql commands. Once added and given admin privilege, you may add additional users and change privileges of those users via the koji command line tool's administrative commands.

However, if you decided to use the simple user/pass method of authentication, then any password setting/changing must be done manually via sql commands as there is no password manipulation support exposed through the koji tools.

The sql commands you need to use vary by authentication mechanism.

Set User/Password Authentication:

root@localhost$ su - koji
koji@localhost$ psql
koji=> insert into users (name, password, status, usertype) values ('admin-user-name', 'admin-password-in-plain-text', 0, 0);

Kerberos authentication: The process is very similar to user/pass except you would replace the first insert above with this:

root@localhost$ su - koji
koji@localhost$ psql
koji=> insert into users (name, krb_principal, status, usertype) values ('admin-user-name', 'admin@EXAMPLE.COM', 0, 0);

SSL Certificate authentication: there is no need for either a password or a Kerberos principal, so this will suffice:

root@localhost$ su - koji
koji@localhost$ psql
koji=> insert into users (name, status, usertype) values ('admin-user-name', 0, 0);

Give yourself admin permissions

The following command will give the user admin permissions. In order to do this you will need to know the ID of the user.

koji=> insert into user_perms (user_id, perm_id, creator_id) values (<id of user inserted above>, 1, <id of user inserted above>);

Note: If you do not know the ID of the admin user, you can get the ID by running the query:

koji=> select * from users;

You can't actually log in and perform any actions until kojihub is up and running in your web server. In order to get to that point you still need to complete the authentication setup and the kojihub configuration. If you wish to access koji via a web browser, you will also need to get kojiweb up and running.

Set Database To Listen On All Addresses The koji-hub service will attempt to connect to the database server in the manner you configure. If you use the system hostname, then the database will need to be avalible on that address. To configure this please perform the following:

  • Edit /var/lib/pgsql/data/postgresql.conf
  • Set listen_addresses = '*'
  • Reload the postgresql service
service postgresql restart

Koji Hub

NOTE: Koji 1.7 and greater uses mod_wsgi. Any mod_python configurations will need to be migrated.

Koji-hub is the center of all Koji operations. It is an XML-RPC server running under mod_wsgi in Apache. koji-hub is passive in that it only receives XML-RPC calls and relies upon the build daemons and other components to initiate communication. Koji-hub is the only component that has direct access to the database and is one of the two components that have write access to the file system.

Configuration Files:

  • /etc/koji-hub/hub.conf
  • /etc/httpd/conf/httpd.conf
  • /etc/httpd/conf.d/kojihub.conf
  • /etc/httpd/conf.d/ssl.conf (when using ssl auth)

Install koji-hub:

root@localhost$ yum install koji-hub httpd mod_ssl

Required Configuration


The apache web server has two places that it sets maximum requests a server will handle before the server restarts. The xmlrpc interface in kojihub is a python application, and processes can sometimes grow outrageously large when it doesn't reap memory often enough. As a result, it is strongly recommended that you set both instances of MaxRequestsPerChild in httpd.conf to something reasonable in order to prevent the server from becoming overloaded and crashing (at 100 the httpd processes will grow to about 75MB resident set size before respawning).

<IfModule prefork.c>
MaxRequestsPerChild  100
<IfModule worker.c>
MaxRequestsPerChild  100


The koji-hub package provides this configuration file. You will need to modify it based on your authentication type. Instructions are contained within the file and should be simple to follow.


If using SSL you will also need to add the needed SSL options for apache. These options should point to where the certificates are located on the hub.

SSLCertificateFile /etc/pki/koji/certs/kojihub.crt
SSLCertificateKeyFile /etc/pki/koji/certs/kojihub.key
SSLCertificateChainFile /etc/pki/koji/koji_ca_cert.crt
SSLCACertificateFile /etc/pki/koji/koji_ca_cert.crt
SSLVerifyClient require
SSLVerifyDepth  10


This file contains the configuration information for the hub. You will need to edit this configuration to point Koji Hub to the database you are using and to setup Koji Hub to utilize the authentication scheme you selected in the beginning.

DBName = koji
DBUser = koji
DBPass = mypassword
DBHost = db.example.com
KojiDir = /mnt/koji
LoginCreatesUser = On
KojiWebURL = http://kojiweb.example.com/koji

If kojihub is running on the same server as the koji db, then DBHost should be set to

Authentication Configuration


If using Kerberos, these settings need to be valid and inline with other services configurations.

AuthPrincipal host/kojihub@EXAMPLE.COM
AuthKeytab /etc/koji.keytab
ProxyPrincipals koji/kojiweb@EXAMPLE.COM
HostPrincipalFormat compile/%s@EXAMPLE.COM

If using SSL auth, these settings need to be valid and inline with other services configurations for kojiweb to allow logins. ProxyDNs should be set to the DN of the kojiweb certificate.

DNUsernameComponent = CN
ProxyDNs = /C=US/ST=Massachusetts/O=Example Org/OU=Example User/CN=example/emailAddress=example@example.com

Koji filesystem skeleton

Above in the kojihub.conf file we set KojiDir to /mnt/koji. For certain reasons, if you change this, you should make a symlink from /mnt/koji to the new location (note: this is a bug and should be fixed eventually). However, before other parts of koji will operate properly, we need to create a skeleton filesystem structure for koji as well as make the file area owned by apache so that the xmlrpc interface can write to it as needed.

cd /mnt
mkdir koji
cd koji
mkdir {packages,repos,work,scratch}
chown apache.apache *

SELinux Configuration

If running in Enforcing mode:

  • you will need to allow apache to connect to the postgreSQL server
  • you will need to allow apache to write some files to disk

Even if you are not currently running in Enforcing mode, it is still recommended to configure the SELinux settings so that there are no future issues with SELinux if Enforcing mode is enabled later on.

root@localhost$ setsebool -P httpd_can_network_connect_db 1
root@localhost$ setsebool -P allow_httpd_anon_write 1
root@localhost$ chcon -R -t public_content_rw_t /mnt/koji/*

If you've placed /mnt/koji on an NFS share you may also need to set httpd_use_nfs.

Check Your Configuration

At this point, you can now restart apache and you should have at least minimal operation. The admin user should be able to connect via the command line client, add new users, etc. It's possible at this time to undertake initial administrative steps such as adding users and hosts to the koji database.

So we will need a working client to test with.

Koji cli - The standard client

The koji cli is the standard client. It can perform most tasks and is essential to the successful use of any koji environment.

Ensure that your client is configured to work with your server. The system-wide koji client configuration file is /etc/koji.conf, and the user-specific one is in ~/.koji/config. You may also use the "-c" option when using the Koji client to specify an alternative configuration file.

If you are using SSL for authentication, you will need to edit the Koji client configuration to tell it which URLs to use for the various Koji components and where their SSL certificates can be found.

For a simple test, all we need is the server and authentication sections.


;url of XMLRPC server
server = http://koji-hub.example.com/kojihub

;url of web interface
weburl = http://koji-web.example.com/koji

;url of package download site
topurl = http://koji-filesystem.example.com/kojifiles

;path to the koji top directory
topdir = /mnt/koji

; configuration for Kerberos authentication

;the service name of the principal being used by the hub
;krbservice = host

; configuration for SSL athentication

;client certificate
cert = ~/.koji/client.crt

;certificate of the CA that issued the client certificate
ca = ~/.koji/clientca.crt

;certificate of the CA that issued the HTTP server certificate
serverca = ~/.koji/serverca.crt

The following command will test your login to the hub:

root@localhost$ koji moshimoshi

Koji Web - Interface for the Masses

NOTE: Koji 1.7 and greater uses mod_wsgi. Any mod_python configurations will need to be migrated.

Koji-web is a set of scripts that run in mod_wsgi and use the Cheetah templating engine to provide an web interface to Koji. koji-web exposes a lot of information and also provides a means for certain operations, such as cancelling builds.

Configuration Files:

  • /etc/httpd/conf.d/kojiweb.conf
  • /etc/httpd/conf.d/ssl.conf

Install Koji-Web:

root@localhost$ yum install koji-web mod_ssl

Required Configuration

/etc/httpd/conf.d/kojiweb.conf: The koji-web package provides this configuration file. You will need to modify it based on your authentication type. Instructions are contained within the file and should be simple to follow.

RHEL 5's mod_python publisher does not support non-basic auth, so Kerberos authentication does not currently work in EPEL 5's Koji-web. See BZ #682319.

/etc/httpd/conf.d/ssl.conf: If you are using SSL you will need to add the needed SSL options for apache.

SSLVerifyClient require
SSLVerifyDepth  10

/etc/kojiweb/web.conf: You will need to edit the kojiweb configuration file to tell kojiweb which URLs it should use to access the hub, the koji packages and its own web interface. You will also need to tell kojiweb where it can find the SSL certificates for each of these components. If you are using SSL authentication, the "WebCert" line below must contain both the public and private key. You will also want to change the last line in the example below to a unique password.

SiteName = koji
# KojiTheme = 

# Necessary urls
KojiHubURL = https://koji-hub.example.com/kojihub
KojiFilesURL = http://koji-filesystem.example.com/kojifiles

## Kerberos authentication options
; WebPrincipal = koji/web@EXAMPLE.COM
; WebKeytab = /etc/httpd.keytab
; WebCCache = /var/tmp/kojiweb.ccache

## SSL authentication options
; WebCert = /etc/pki/koji/koji-web.pem
; ClientCA = /etc/pki/koji/ca_cert.crt
; KojiHubCA = /etc/pki/koji/ca_cert.crt

LoginTimeout = 72

# This must be set before deployment
#Secret = CHANGE_ME

LibPath = /usr/share/koji-web/lib

Optional Configuration

You'll need to make /mnt/koji/ web-accessible, either here, on the hub, or on another web server altogether. This URL will go into various clients

  • /etc/kojiweb/web.conf as KojiFilesURL
  • /etc/kojid/kojid.conf as topurl
  • /etc/koji.conf as topurl
Alias /kojifiles/ /mnt/koji/
<Directory "/mnt/koji/">
    Options Indexes
    AllowOverride None
    Order allow,deny
    Allow from all

Web interface now operational

At this point you should be able to point your web browser at the kojiweb URL and be presented with the koji interface. Many operations should work in read only mode at this point, and any configured users should be able to log in.

Koji Daemon - Builder

Kojid is the build daemon that runs on each of the build machines. Its primary responsibility is polling for incoming build requests and handling them accordingly. Koji also has support for tasks other than building such as creating livecd images or raw disk images, and kojid is responsible for handling these tasks as well. kojid uses mock for creating pristine build environments and creates a fresh one for every build, ensuring that artifacts of build processes cannot contaminate each other. kojid is written in Python and communicates with koji-hub via XML-RPC.

Configuration Files:

  • /etc/kojid/kojid.conf - Koji Daemon Configuration
  • /etc/sysconfig/kojid - Koji Daemon Switches

Install kojid:

root@localhost$ yum install koji-builder

Required Configuration

Add the host entry for the koji builder to the database You will now need to add the koji builder to the database so that they can be utilized by kojij hub. Make sure you do this before you start kojid for the first time, or you'll need to manually remove entries from the sessions and users table before it can be run successfully.

kojiadmin@localhost$ koji add-host kojibuilder1.example.com i386 x86_64

The first argument used after the add-host command should the username of the builder. The second argument is used to specify the architecture which the builder uses.

/etc/kojid/kojid.conf: The configuration file for each koji builder must be edited so that the line below points to the URL for the koji hub. The user tag must also be edited to point to the username used to add the koji builder.

; The URL for the xmlrpc server

; the username has to be the same as what you used with add-host
; in this example follow as below
user = kojibuilder1.example.com

This item may be changed, but may not be the same as KojiDir on the kojihub.conf file (although it can be something under KojiDir, just not the same as KojiDir)

; The directory root for temporary storage

The root of the koji build directory (ie, /mnt/koji) must be mounted on the builder. An NFS mount is the easiest way to handle this.

Optional Configuration (SSL certificates)

/etc/kojid/kojid.conf: If you are using SSL, these settings need to be edited to point to the certificates you generated at the beginning of the setup process.

;client certificate
; This should reference the builder certificate we created on the kojihub CA, for kojibuilder1.example.com
; ALSO NOTE: This is the PEM file, NOT the crt
cert = /etc/kojid/kojid.pem

;certificate of the CA that issued the client certificate
ca = /etc/kojid/koji_ca_cert.crt

;certificate of the CA that issued the HTTP server certificate
serverca = /etc/kojid/koji_ca_cert.crt

It is important to note that if your builders are hosted on seperate machines from koji hub and koji web, you will need to scp the certificates mentioned in the above configuration file from the /etc/kojid/ directory on koji hub to the /etc/koji/ directory on the local machine so that the builder can be authenticated.

Optional Configuration (Kerberos Authentication)

/etc/kojid/kojid.conf: If using Kerberos, these settings need to be valid and inline with other services configurations.

; the username has to be the same as what you used with add-host
;user =


By default it will look for the Kerberos keytab in /etc/kojid/kojid.keytab

Note: Kojid will not attempt kerberos authentication to the koji-hub unless the username field is commented out

Add the host to the createrepo channel

Channels are a way to control which builders process which tasks. By default hosts are added to the default channel. At least some build hosts also needs to be added to the createrepo channel so there will be someone to process repo creation tasks initiated by kojira.

kojiadmin@localhost$ koji add-host-to-channel kojibuilder1.example.com createrepo

A note on capacity

The default capacity of a host added to the host database is 2. This means that once the load average on that machine exceeds 2, kojid will not accept any additional tasks. This is separate from the maxjobs item in the configuration file. Before kojid will accept a job, it must pass both the test to ensure the load average is below capacity and that the current number of jobs it is already processing is less than maxjobs. However, in today's modern age of quad core and higher CPUs, a load average of 2 is generally insufficient to fully utilize hardware.

koji edit-host --capacity=16 kojibuilder1.example.com

The koji-web interface also offers the ability to edit this value to admin accounts.

You can also set this via direct SQL (required in koji < 1.8)

koji@localhost$ psql koji
koji=# select (id, name, capacity) from host;
(2 rows)

koji=# update host set capacity = 16 where id = 1;

Start Kojid

Once the builder has been added to the database you must start kojira

root@localhost$ /sbin/service kojid start

Check /var/log/kojid.log to verify that kojid has started successfully. If the log does not show any errors then the koji builder should be up and ready. You can check this by pointing your web browser to the web interface and clicking on the hosts tab. This will show you a list of builders in the database and the status of each builder.

Kojira - Yum repository creation and maintenance

Configuration Files:

  • /etc/kojira/kojira.conf - Kojira Daemon Configuration
  • /etc/sysconfig/kojira - Kojira Daemon Switches

Install kojira

root@localhost$ yum install koji-utils

Required Configuration

Add the user entry for the kojira user The kojira user requires the repo permission to function.

kojiadmin@localhost$ koji add-user kojira
kojiadmin@localhost$ koji grant-permission repo kojira

/etc/kojira/kojira.conf: This needs to point at your koji-hub.

; The URL for the xmlrpc server

Additional Notes:

  • Kojira needs read-write access to /mnt/koji.
  • There should only be one instance of kojira running at any given time.
  • It is not recommended that kojira run on the builders, as builders only should require read-only access to /mnt/koji.
  • Kojira may need to be restarted when new tags are added in order to detect those tags correctly.

Optional Configuration

/etc/kojira/kojira.conf: If using SSL, these settings need to be valid.

;client certificate
; This should reference the kojira certificate we created above
cert = /etc/pki/koji/kojira.pem

;certificate of the CA that issued the client certificate
ca = /etc/pki/koji/koji_ca_cert.crt

;certificate of the CA that issued the HTTP server certificate
serverca = /etc/pki/koji/koji_ca_cert.crt

If using Kerberos, these settings need to be valid.

; For Kerberos authentication
; the principal to connect with
; The location of the keytab for the principal above

/etc/sysconfig/kojira: The local user kojira runs as needs to be able to read and write to /mnt/koji/repos/. If the volume that directory resides on is root-squashed or otherwise unmodifiable by root, you can set RUNAS= to a user that has the required privileges.

Start Kojira

root@localhost$ /sbin/service kojira start

Check /var/log/kojira/kojira.log to verify that kojira has started successfully.

Bootstrapping the Koji build environment

For instructions on importing packages and preparing Koji to run builds, see Server Bootstrap .

For instructions on using External Repos and preparing Koji to run builds, see External Repo Server Bootstrap .

Useful scripts and config files for setting up a Koji instance are available here

Minutia and Miscellany

Please see KojiMisc for additional details and notes about operating a koji server.