I recently discovered that you can assign descriptions to your OpenVZ instances. This isn’t really that surprising but I never really took the the time until now to scan through the vzctl and vzlist man pages. Prior to discovering these more esoteric features of vzctl and vzlist, I’d normally just run this command to see what’s what with my OpenVZ instances:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # list of all VE instances % vzlist -a CTID NPROC STATUS IP_ADDR HOSTNAME 101 32 running 10.1.1.101 flanders.mydom.net 102 49 running 10.1.1.102 lisa.mydom.net 103 36 running - bart.mydom.net 104 38 running 10.1.1.104 marge.mydom.net 105 34 running 10.1.1.105 homer.mydom.net 106 31 running 10.1.1.106 kang.mydom.net 107 27 running 10.1.1.107 kodos.mydom.net 108 32 running 10.1.1.108 maude.mydom.net 109 30 running 10.1.1.109 nelson.mydom.net 110 32 running 10.1.1.110 ralphie.mydom.net 111 30 running 10.1.1.111 martin.mydom.net |
This had worked fine, but sometimes I’d draw a blank about what’s running in each instance, hence my need for the description column. You can use the following command to see the description of each instance.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # initial description columns for VEs % vzlist -o ctid,numproc,status,ip,hostname,description CTID NPROC STATUS IP_ADDR HOSTNAME DESCRIPTION 101 34 running 10.1.1.101 flanders.mydom.net - 102 49 running 10.1.1.102 lisa.mydom.net - 103 35 running - bart.mydom.net - 104 38 running 10.1.1.104 marge.mydom.net - 105 34 running 10.1.1.105 homer.mydom.net - 106 31 running 10.1.1.106 kang.mydom.net - 107 27 running 10.1.1.107 kodos.mydom.net - 108 32 running 10.1.1.108 maude.mydom.net - 109 30 running 10.1.1.109 nelson.mydom.net - 110 32 running 10.1.1.110 ralphie.mydom.net - 111 30 running 10.1.1.111 martin.mydom.net - |
I used the following commands to set the description for each VE.
1 2 3 4 5 6 7 8 9 10 11 | vzctl set 101 --description "nis server" --save vzctl set 102 --description "mail,imap,smtp server" --save vzctl set 103 --description "samba server" --save vzctl set 104 --description "mysql server" --save vzctl set 105 --description "www,blog,webmail server" --save vzctl set 106 --description "trac,git,svn server" --save vzctl set 107 --description "trac,git,svn server (dev)" --save vzctl set 108 --description "ldap server (dev)" --save vzctl set 109 --description "cacti server" --save vzctl set 110 --description "tracks server" --save vzctl set 111 --description "wiki server" --save |
Re-running the vzlist command from before now shows the newly added descriptions.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # filled out description columns for VEs % vzlist -o ctid,numproc,status,ip,hostname,description CTID NPROC STATUS IP_ADDR HOSTNAME DESCRIPTION 101 32 running 10.1.1.101 flanders.mydom.net nis server 102 49 running 10.1.1.102 lisa.mydom.net mail,imap,smtp server 103 36 running - bart.mydom.net samba server 104 38 running 10.1.1.104 marge.mydom.net mysql server 105 34 running 10.1.1.105 homer.mydom.net www,blog,webmail server 106 31 running 10.1.1.106 kang.mydom.net trac,git,svn server 107 27 running 10.1.1.107 kodos.mydom.net trac,git,svn server (dev) 108 32 running 10.1.1.108 maude.mydom.net ldap server (dev) 109 30 running 10.1.1.109 nelson.mydom.net cacti server 110 32 running 10.1.1.110 ralphie.mydom.net tracks server 111 30 running 10.1.1.111 martin.mydom.net wiki server |
July 26th, 2009, @ 11:31 pm |
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Cool site, love the info.