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. 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>