Jenkins oVirt Server

oVirt Jenkins server is jenkins.ovirt.org (107.22.215.130)

Recommended server specs

These are specs for servers to run Jenkins slaves for oVirt testing. One base configuration could be:

• 16 GB RAM each
• 4/8 cores each
• 200 GB disk each
• 32 GB swap

Access to the server

• OS Level Access: Restricted to infra team only. (PKI)
• Read UI Access: Anonymous read access is available to see all jobs/workspaces and build results.
• Login UI Access: availialble only to infra team, and by request to infra@ovirt.org.

Contact Infra team if you think you should have privileged access to the server.

Troubleshooting OS level access:

restorecon -R -v /home/user
restorecon -R -v /home/user/.ssh
chmod 700 /home/user/.ssh
chmod 600 /home/user/.ssh/authorized_keys
passwd user

Installation

1. Install LTS version from http://pkg.jenkins-ci.org/redhat-stable/
2. Run it behind Apache: https://wiki.jenkins-ci.org/display/JENKINS/Running+Jenkins+behind+Apache
3. chkconfig httpd on
4. yum install java-1.6.0-openjdk-devel git postgresql postgresql-server postgresql-contrib
5. Run /etc/init.d/postgresql initdb
6. Set postgresql in pg_hba.conf to trust
7. Restart PostgreSQL service

8. Add engine ‘role’ as superuser to PostgreSQL:

   psql -U postgres -c "CREATE ROLE engine WITH LOGIN SUPERUSER"
   

9. service jenkins start

10. Install Jenkins plugins:

    wget http://localhost:8080/jnlpJars/jenkins-cli.jar
    java -jar jenkins-cli.jar -s http://localhost:8080 install-plugin audit-trail
    java -jar jenkins-cli.jar -s http://localhost:8080 install-plugin git
    java -jar jenkins-cli.jar -s http://localhost:8080 install-plugin multiple-scms
    java -jar jenkins-cli.jar -s http://localhost:8080 install-plugin analysis-collector
    java -jar jenkins-cli.jar -s http://localhost:8080 install-plugin findbugs
    java -jar jenkins-cli.jar -s http://localhost:8080 install-plugin Email-ext
    java -jar jenkins-cli.jar -s http://localhost:8080 install-plugin port-allocator
    

11. Config JAVA_HOME in Jenkins > configuration
12. Config default maven in Jenkins > configuration

13. Edit /etc/sysconfig/jenkins (replace line):

    JENKINS_JAVA_OPTIONS="-Djava.awt.headless=true -Xms4g -Xmx4g -XX:MaxPermSize=1024M"
    

14. increase limit of open file using ulimit -n (for persistent change add to /etc/sysctl.conf): fs.file-max = 2048
15. Amazon EC2 doesn’t come with swap space, so create a swap file or swap partition.

Create swap space

Check to see if you have the /dev/xvdk device available (fdisk -cul).

If /dev/xvdk exists, follow these steps:

1. Edit the storage device:

   fdisk -cu /dev/xvdk
   

2. Create a new swap partition (type 82) and save changes.

3. Create swap:

   mkswap /dev/xvdk1
   

4. Activate swap:

   swapon /dev/xvdk1
   

5. Add device to the filesystem list:

   echo "/dev/xvdk1       none    swap    sw      0       0" >> /etc/fstab
   

If /dev/xvdk does not exist, create a swapfile.

Add temporary space for workspace (deletes data after reboot)

mkfs -t ext4 /dev/xvdj
mkdir /ephemeral0
echo "/dev/xvdj /ephemeral0 ext4 defaults 1 2" >> /etc/fstab
mount /ephemeral0

Expand default root partition

Amazon VM comes with a default 5GB / partition. but it actually has 50GB you can use. run this command to expand it

resize2fs /dev/xvde1

Change open files

Jenkins slave might run out of openfiles. to change this you need to run:

1. ulimit -n 2048

2. Edit /etc/sysctl.conf:

   fs.file-max = 2048
   

3. Edit /etc/security/limits.conf:

   jenkins  soft    nofiles    2048
   jenkins  hard    nofiles    2048
   

allows sudo access for jenkins user

Jenkins user needs sudo access to be able to run tests from jenkins jobs, do this on each jenkins slave: edit /etc/suders:

1. Comment out this line:

   Defaults    requiretty
   

2. Add the line:

   jenkins ALL=(ALL)       NOPASSWD: ALL