SCI-CD

h1. Basic cluster management

h3. Check if all is ok

<pre>
gnt-cluster verify
</pre>

h3. Show detailed information

<pre>
gnt-(cluster|node|instance) info
</pre>

h3. List objects

Nodes
<pre>
gnt-node list
</pre>

Configured instances
<pre>
gnt-instance list
</pre>

h3. Create new instance

New instance on the NODE1 with failover on the NODE2, with one disk size 10Gb and 256M RAM.
INSTANCE_NAME must be resolvable via DNS.
<pre>
gnt-instance add -t drbd -o debootstrap+default -s 10g -B memory=256m -n NODE1:NODE2 INSTANCE_NAME
</pre>

Real example: create new instance
* on the node gnt2
* with failover on gnt1
* with three disks:
** 10g on volume group xenvg
** 600m on volume group xenvg (probably for swap)
* 5g on volume group xenvg
* DNS name vg-test1
* IP address will be configured automatically by resolving vg-test1' IP and matching it against @/etc/ganeti/networks@

<pre>
gnt-instance add -t drbd -o debootstrap+default --disk 0:size=10g,vg=xenvg --disk 1:size=600m,vg=xenvg --disk 2:size=5g,vg=newvg -B memory=256m -n gnt2:gnt1 vg-test1
</pre>

*NOTE:* the @vg=....@ option to specify different volume groups will be available since Ganeti 2.4.0 release.

h3. Windows install

For windows install see [[WINDOWS-INSTALL]]

h3. Instance import

For example, you have an image, tar, etc. of OS from other XEN(or physical) machine.
To start it on sci-cd you must add instance with --no-install flag:
<pre>
gnt-instance add -t drbd -B memory=5192m -n node1:node2 -o debootstrap+default --no-install --no-name-check --no-ip-check --net=0:link=dmz --disk 0:size=4G --disk 1:size=1024M --disk 2:size=100G --disk 3:size=50G terminal
</pre>
--no-namecheck used when machine name doesn't resolv in any ip(ip may resolve my dns or /etc/hosts)
--no-ip-check used when no ip provided while creating instance

h3. Instance manipulations

Various simple instance manipulations
<pre>
gnt-instance (startup|shutdown|reboot|failover|remove|console) INSTANCE
</pre>

h3. OS command execution

Run OS command on all nodes
<pre>
gnt-cluster command .....
</pre>

h2. SSH

All new instances, including 'sci' are going with empty root password and no ssh server installed.
You should first log in to the instance using @gnt-instance console INSTANCE@ command, then set
root's password using @passwd@ command and install ssh server using
<pre>
apt-get install openssh-server
</pre>