Buildbot Setup for Virtual Machines - CentOS 6.2

Explains how to provision and configure virtual machine instances specifically for Buildbot testing.

Base install

qemu-img create -f qcow2 /kvm/vms/vm-centos6-amd64-serial.qcow2 8G
qemu-img create -f qcow2 /kvm/vms/vm-centos6-i386-serial.qcow2 8G

Start each VM booting from the server install iso one at a time and perform the following install steps:

kvm -m 1024 -hda /kvm/vms/vm-centos6-amd64-serial.qcow2 -cdrom /kvm/iso/centos/CentOS-6.2-x86_64-bin-DVD1.iso -redir tcp:22255::22 -boot d -smp 2 -cpu qemu64 -net nic,model=virtio -net user
kvm -m 1024 -hda /kvm/vms/vm-centos6-i386-serial.qcow2 -cdrom /kvm/iso/centos/CentOS-6.2-i386-bin-DVD1.iso -redir tcp:22256::22 -boot d -smp 2 -cpu qemu32,-nx -net nic,model=virtio -net user

Once running you can connect to the VNC server from your local host with:

vncviewer -via ${remote-host} localhost

Replace ${remote-host} with the host the vm is running on.

Note: When you activate the install, vncviewer may disconnect with a complaint about the rect being too large. This is fine. The CentOS installer has just resized the vnc screen. Simply reconnect.

Install, picking default options mostly, with the following notes:

• The Installer will throw up a "Storage Device Warning", choose "Yes, discard any data"

• Set the hostname to centos6-amd64 (or centos6-i386)

• Click the "Configure Network" button on the Hostname screen.

  • Edit System eth0 to "connect automatically"

  • Apply and then close the "Network Connections" window

• Set Timezone to Europe/Helsinki (keep "System clock uses UTC" checked)

• When partitioning disks, choose "Use All Space"

  • do not check the "Encrypt system" checkbox

  • do check the "Review and modify partitioning layout" checkbox

  • Delete the LVM stuff and leaving the sda1 partition alone, repartition the physical volume as follows

Device	Size(MB)	Mount Point	Type	Format
sda2	5672	/	ext4	yes
sda3	(max allowable)	(n/a)	swap	yes

• Minimal install

• Customize Later

When the install is finished, you will be prompted to reboot. Go ahead and do so, but it will fail. Kill the VM (after the reboot fails) and start it up again:

kvm -m 1024 -hda /kvm/vms/vm-centos6-amd64-serial.qcow2 -redir tcp:22255::22 -boot c -smp 2 -cpu qemu64 -net nic,model=virtio -net user

kvm -m 1024 -hda /kvm/vms/vm-centos6-i386-serial.qcow2 -redir tcp:22256::22 -boot c -smp 2 -cpu qemu32,-nx -net nic,model=virtio -net user

You may connect via VNC as before, but ssh is probably preferred. Login as root.

Now that the VM is installed, it's time to configure it.

ssh -p 22255 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i ~/.ssh/buildbot.id_dsa root@localhost
ssh -p 22256 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i ~/.ssh/buildbot.id_dsa root@localhost

After logging in as root, create a local user

adduser ${username}
usermod -a -G wheel ${username}
passwd ${username}

Enable password-less sudo and serial console:

visudo
# Uncomment the line "%wheel        ALL=(ALL)       NOPASSWD: ALL"
# Comment out this line:
# Defaults    requiretty

Still logged in as root, add to /boot/grub/menu.lst:

serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
terminal --timeout=3 serial console

also add in menu.lst to kernel line (after removing 'quiet'):

console=tty0 console=ttyS0,115200n8

Add login prompt on serial console:

cat >>/etc/inittab <<END

# Serial console.
S0:2345:respawn:/sbin/agetty -h -L ttyS0 19200 vt100
END

Logout as root, and then, from the VM host server:

Install proper ssh:

ssh -t -p 22255 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i ~/.ssh/buildbot.id_dsa localhost "sudo yum install openssh-server openssh-clients"
ssh -t -p 22256 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i ~/.ssh/buildbot.id_dsa localhost "sudo yum install openssh-server openssh-clients"

Create a .ssh folder:

ssh -t -p 22255 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i ~/.ssh/buildbot.id_dsa localhost "mkdir -v .ssh"
ssh -t -p 22256 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i ~/.ssh/buildbot.id_dsa localhost "mkdir -v .ssh"

Copy over the authorized keys file:

scp -P 22255 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /kvm/vms/authorized_keys localhost:.ssh/
scp -P 22256 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /kvm/vms/authorized_keys localhost:.ssh/

Set permissions on the .ssh folder correctly:

ssh -t -p 22255 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i ~/.ssh/buildbot.id_dsa localhost "chmod -R go-rwx .ssh"
ssh -t -p 22256 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -i ~/.ssh/buildbot.id_dsa localhost "chmod -R go-rwx .ssh"

Create the buildbot user:

ssh -p 22255 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no localhost 'chmod -R go-rwx .ssh; sudo adduser buildbot; sudo usermod -a -G wheel buildbot; sudo mkdir ~buildbot/.ssh; sudo cp -vi .ssh/authorized_keys ~buildbot/.ssh/; sudo chown -vR buildbot:buildbot ~buildbot/.ssh; sudo chmod -vR go-rwx ~buildbot/.ssh'
ssh -p 22256 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no localhost 'chmod -R go-rwx .ssh; sudo adduser buildbot; sudo usermod -a -G wheel buildbot; sudo mkdir ~buildbot/.ssh; sudo cp -vi .ssh/authorized_keys ~buildbot/.ssh/; sudo chown -vR buildbot:buildbot ~buildbot/.ssh; sudo chmod -vR go-rwx ~buildbot/.ssh'

Upload the ttyS0.conf file and put it where it goes:

scp -P 22255 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /kvm/vms/ttyS0.conf buildbot@localhost:
scp -P 22256 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /kvm/vms/ttyS0.conf buildbot@localhost:

ssh -p 22255 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no buildbot@localhost 'sudo cp -vi ttyS0.conf /etc/init/; rm -v ttyS0.conf;'
ssh -p 22256 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no buildbot@localhost 'sudo cp -vi ttyS0.conf /etc/init/; rm -v ttyS0.conf;'

Update the VM:

ssh -p 22255 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no buildbot@localhost
ssh -p 22256 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no buildbot@localhost

Once logged in:

sudo yum update

After updating, shut down the VM:

sudo shutdown -h now

VMs for building .rpms

for i in '/kvm/vms/vm-centos6-amd64-serial.qcow2 22255 qemu64' '/kvm/vms/vm-centos6-i386-serial.qcow2 22256 qemu64' ; do \
  set $i; \
  runvm --user=buildbot --logfile=kernel_$2.log --base-image=$1 --port=$2 --cpu=$3 "$(echo $1 | sed -e 's/serial/build/')" \
    "sudo yum -y groupinstall 'Development Tools'" \
    "sudo yum -y install wget tree gperf readline-devel ncurses-devel zlib-devel pam-devel libaio-devel openssl-devel libxml2 libxml2-devel unixODBC-devel bzr perl perl\(DBI\)" \
    "sudo yum -y remove systemtap-sdt-dev" \
    "bzr co --lightweight lp:mariadb-native-client" \
    "sudo mkdir -vp /usr/src/redhat/SOURCES /usr/src/redhat/SPECS /usr/src/redhat/RPMS /usr/src/redhat/SRPMS" \
    "wget http://www.cmake.org/files/v2.8/cmake-2.8.8.tar.gz;tar -zxvf cmake-2.8.8.tar.gz;cd cmake-2.8.8;./configure;make;sudo make install"; \
done

Also:

• Installing the Boost library needed for the OQGraph storage engine

VMs for install testing.

MariaDB.local.repo points at a local directory on the VM. MariaDB.repo points at the real MariaDB YUM repository.

for i in '/kvm/vms/vm-centos6-amd64-serial.qcow2 22255 qemu64' '/kvm/vms/vm-centos6-i386-serial.qcow2 22256 qemu64' ; do \
  set $i; \
  runvm --user=buildbot --logfile=kernel_$2.log --base-image=$1 --port=$2 --cpu=$3 "$(echo $1 | sed -e 's/serial/install/')" \
    "sudo yum -y update" \
    "sudo yum -y install patch libaio perl perl-Time-HiRes perl-DBI libtool-ltdl unixODBC" \
    "= scp -P $2 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /kvm/vms/MariaDB.local.repo buildbot@localhost:/tmp/" \
    "sudo mv -vi /tmp/MariaDB.local.repo /etc/yum.repos.d/"; \
done

VMs for MySQL upgrade testing

for i in '/kvm/vms/vm-centos6-amd64-serial.qcow2 22255 qemu64' '/kvm/vms/vm-centos6-i386-serial.qcow2 22256 qemu64' ; do \
  set $i; \
  runvm --user=buildbot --logfile=kernel_$2.log --base-image=$1 --port=$2 --cpu=$3 "$(echo $1 | sed -e 's/serial/upgrade/')" \
    "sudo yum -y update" \
    'sudo yum -y install mysql-server libtool-ltdl unixODBC' \
    'sudo /etc/init.d/mysqld start' \
    'mysql -uroot -e "create database mytest; use mytest; create table t(a int primary key); insert into t values (1); select * from t"' \
    "= scp -P $2 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /kvm/vms/MariaDB.local.repo buildbot@localhost:/tmp/" \
    "sudo mv -vi /tmp/MariaDB.local.repo /etc/yum.repos.d/"; \
done

The MariaDB upgrade testing VMs were not built. There is currently an error with installing MariaDB from the YUM repo.

VMs for MariaDB upgrade testing

for i in '/kvm/vms/vm-centos6-amd64-serial.qcow2 22255 qemu64' '/kvm/vms/vm-centos6-i386-serial.qcow2 22256 qemu64' ; do \
  set $i; \
  runvm --user=buildbot --logfile=kernel_$2.log --base-image=$1 --port=$2 --cpu=$3 "$(echo $1 | sed -e 's/serial/upgrade2/')" \
    'sudo yum -y update' \
    "= scp -P $2 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /kvm/vms/MariaDB.repo buildbot@localhost:/tmp/" \
    'sudo rpm --verbose --import http://downloads.mariadb.org/repo/RPM-GPG-KEY-MariaDB' \
    'sudo mv -vi /tmp/MariaDB.repo /etc/yum.repos.d/' \
    'sudo yum -y remove mysql-libs' \
    'sudo yum -y install MariaDB-server MariaDB-client MariaDB-test' \
    'sudo yum -y install cronie cronie-anacron crontabs.noarch postfix' \
    'sudo /etc/init.d/mysqld start' \
    'mysql -uroot -prootpass -e "create database mytest; use mytest; create table t(a int primary key); insert into t values (1); select * from t"' \
    'sudo rm -v /etc/yum.repos.d/MariaDB.repo' \
    "= scp -P $2 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no /kvm/vms/MariaDB.local.repo buildbot@localhost:/tmp/" \
    'sudo mv -vi /tmp/MariaDB.local.repo /etc/yum.repos.d/'; \
done

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