A Sysadmin-Toolkit Plugin that can validate that commands and files are symmetric across a cluster of Linux machines.
The Clustering Plugin is built for Sysadmin Toolkit and provides basic cluster health checking, such as verifying that configured files and command are the same.
Built on the ClusterShell python package, it provides to other plugins a way to execute shell commands to nodes of a cluster.
Clustering Plugin is coded for python 2.7 on Ubuntu 12.04, and requires the following packages:
- Sysadmin-Toolkit (https://github.com/lpther/SysadminToolkit)
- ClusterShell 1.6 (https://github.com/cea-hpc/clustershell, Ubuntu package available at https://launchpad.net/ubuntu/+archive/primary/+files/clustershell_1.6-1_all.deb)
Either use ClusterShell's group configuration to define all your groups to host mapping, or list nodes in the default-nodeset configuration option.
echo "all: node-[1-2]" > /etc/clustershell/groups
Define in the configuration file the default nodeset, symmetric files and commands:
[clustering]
default-nodeset = @all
symmetric-files = /etc/resolv.conf,
/etc/r*.conf,
recursive|/etc/udev/rules.d,
/etc/hostname,
symmetric-commands = @all:uname | grep -i Linux,
@all:echo $RANDOM \; uptime,
Display files that are supposed to be exactly the same across the cluster:
sysadmin-toolkit# show cluster symmetric-files
Group: default
/etc/resolv.conf: Symmteric
node-1, node-2:
8aa7cfabf13c9f9ae48176fcba4a17bc /etc/resolv.conf
/etc/hostname: Asymmetric
node-2:
6d8d0a4b57ecac70623624eb45489571 /etc/hostname
node-1:
43b43e627630d21ef803d47c4a4b8976 /etc/hostname
/etc/r*.conf: Symmteric
node-1, node-2:
6a05320976aec88f9aa3ca964e2032f7 /etc/rsyslog.conf
8aa7cfabf13c9f9ae48176fcba4a17bc /etc/resolv.conf
/etc/udev/rules.d (recursive): Asymmetric
node-1:
3b6de9f3f911176734c66903b4f8735c /etc/udev/rules.d/README
40f92b969ccc80deddc428d3ea2e9739 /etc/udev/rules.d/70-persistent-cd.rules
572f30a27275db3351fd40fa25afc0fb /etc/udev/rules.d/70-persistent-net.rules
node-2:
3b6de9f3f911176734c66903b4f8735c /etc/udev/rules.d/README
40f92b969ccc80deddc428d3ea2e9739 /etc/udev/rules.d/70-persistent-cd.rules
d1175f6d8a17b5e8c82c52b547e33676 /etc/udev/rules.d/70-persistent-net.rules
Display commands that should return the same output across the cluster:
sysadmin-toolkit# show cluster symmetric-commands
Group: @all
"echo $RANDOM ; uptime" : Asymmetric
node-2:
18910
02:13:00 up 24 days, 7:15, 2 users, load average: 0.00, 0.01, 0.05
node-1:
20614
02:13:00 up 24 days, 7:19, 8 users, load average: 0.36, 0.14, 0.09
"uname | grep -i Linux" : Symmteric
node-2, node-1:
Linux
Validate node reachability detected by the Plugin, and display configuration:
sysadmin-toolkit# debug clustering
Clustering plugin configuration and state:
Clustering plugin version: 0.1.0a
ClusterShell version: 1.6
*** Registered node groups ***
default: node-[1-2]
reachable nodes: node-[1-2]
@all: node-[1-2]
reachable nodes: node-[1-2]
*** Symmetric files configuration ***
Group: @all
/etc/resolv.conf
/etc/hostname
/etc/r*.conf
/etc/udev/rules.d (recursive)
*** Symmetric commands configuration ***
Group: @all
echo $RANDOM ; uptime
uname | grep -i Linux
- Sysadmin-Toolkit (https://github.com/lpther/SysadminToolkit)
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