Lightweight cluster management software-clustershell

If the number of clusters is not large, it is very necessary to choose a lightweight cluster management software. Clustershell is such a small cluster management tool, the principle is the use of SSH, can be said to be a Linux system very useful operational tools

Clustershell abbreviation Clush Advantages:

Easy to install. An instruction can be easily installed
Easy to configure. Many cluster management software need to install software on all the servers, but also to do a lot of connection operation, Clustershell is quite convenient, just need all the machine can ssh without password login, and then only install Clustershell on a single server
The easy-to-Clustershell command is relatively simple, with only one or two instructions and three or four parameters to remember

Lab Environment: CentOS7

192.168.94.11 Clustershell

192.168.94.22 host1

192.168.94.33 Host2

Install Clustershell can be used with yum, or can be installed with the source code

Yum Install Clustershell

Do host Name Mapping

[Email protected] ~]# vim/etc/hosts192.168. 94.11 Clustershell                                                                    192.168. 94.22 host1 192.168. 94.33 Host2

Configure SSH key to login for password-free login

To write a simple batch distribution key and Polygon interaction script, first need to download Sshpass

Yum Install Sshpass

Usage: Sshpass [-f |-d |-P |-e] [-HV] Command parameter-f filename Get password from file-D number use number as the file descriptor for Get password-p password provide password as parameter (security unwise)-e password as Env-var "Sshpass" Pass no parameters-the password will get the-h display Help from standard input (this screen)-V Print version information should use a maximum of-f,-d,-p or-E

[Email protected] ~]# vim Sshkey.SH#!/bin/bash./etc/rc.d/init.d/functions# create key \RM~/.SSH/id_rsa*-FSsh-keygen-T rsa-f ~/.SSH/id_rsa-n""-q# Distributing public keys forIpinch  A  -   DoSshpass-F ~/.sshpassSSH-copy-ID-I. ~/.SSH/id_rsa.pub [email protected]192.168.94. $IP-o stricthostkeychif[$?-eq0]; ThenAction"Copy-id 192.168.94. $ip"/bin/trueElseAction"Copy-id 192.168.94. $ip"/bin/falsefiEcho "" Done

Add Execute Permissions script to script to use the password file location and name customization, because it is a password file, permissions 600

chmod +x sshkey. SH  chmod ~/~]# ll ~/. Sshpass1 September   8  :/root/.sshpass

Perform a script test and do a host name Mapping

Get started with Clustershell for batch management

Configuration Clush:
In the/etc/clustershell directory, create the groups file manually

[Email protected] ~]# vim/etc/clustershell/groupsall:host[1,2]web: Host1db:host2   -A This parameter, separated by a space between the host

Common parameters for Clush management commands:
-G after specifying the set of groups
-A represents all groups
-W followed by a host node, separated by commas between multiple hosts
-X means that a node is removed from operation. followed by a host node, separated by commas between multiple hosts
-X means that a group is removed and multiple groups are separated by commas
-B Same Output result merged

Date255

change the previous IP to host name

Execute Script

[[email protected] ~]# CLUSH-G DBDatehost2:2018 Saturday September 08 -:Geneva: -Cst[[email protected]~]# clush-g WebDatehost1:2018 Saturday September 08 -:Geneva: -Cst[[email protected]~]# clush-aDatehost1:2018 Saturday September 08 -: to:xxcsthost2:2018 Saturday September 08 -: to:xxcst# support for operations such as pipelines and redirects [[email protected]~]# clush-a'echo I Love Wife >/tmp/1314'[[Email protected]~]# clush-aCat/tmp/1314host2:i Love wifehost1:i love Wife[[email protected]~]# Clush-WHost1ifconfigens33|awk-F'[ :]+' 'Nr==2{print}'192.168.94.22# plus-the B option can be the same result combined output [[email protected]~]# Clush-abDate---------------host[1-2] (2)---------------Saturday, September 08, 2018 -: -: *Cst[[email protected]~]# Clush-abhostname---------------host1---------------host1---------------Host2---------------Host2[[email protected]~]# Clush-abCat/etc/centos-Release---------------host[1-2] (2)---------------CentOS Linux Release7.5.1804(Core)

Clush can also be used for the distribution of files and directories:

--copy means copying files or directories locally from a local to a remote cluster node, equal to-C
--rcopy means copying files or directories from a remote cluster node to this computer
--dest the file or directory path to be copied locally, followed by the Remote Storage path

[Email protected] ~]#Catmingming I Love Wife[[email protected]~]# clush-g web-c/root/mingming--dest/Root[[email protected]~]# clush-g WebCat/root/mingming host1:i Love Wife[[email protected]~]# Clush-WHost2-c/root/mingming--dest=/root/[[Email protected]~]# Clush-WHost2Cat/root/mingming host2:i Love wife# Copy Local directory to remote node [[email protected]~]# clush-g Webls-l/root/host1: Total dosage14708host1:-RW-------.1Root root1257May - Geneva: +anaconda-Ks.cfghost1:-rwxr-xr-x.1Root root2236June4  A: -Dns.SHhost1:-rw-r--r--.1Root root15039314August -  -: +Master.Ziphost1:-rw-r--r--1Root root ASeptember8  -: -MINGMINGHOST1:DRWXR-xr-x2Root root6September8  -: -MYWIFEHOST1:DRWXR-xr-x.TenRoot root4096August -  -: WuVIMHOST1:DRWXR-xr-x.9Root root4096August -  -: -vim-master# Copy a directory or file from a remote node to a local [[email protected]~]# CD mywife/[email protected] mywife]#pwd/root/Mywife[[email protected] mywife]#ls[email protected] mywife]# Clush-a--rcopy/root/mingming--dest./[email protected] mywife]#lsmingming.host1 mingming.host2# Remote Copy file to local, the suffix is appended with the hostname of the node

--user=username, which indicates the user who logged in to SSH when using the Clush command

For example, I use the root account of this machine to manage the Damowang user of the Host1 node

ssh-copy-ID -I. ~/. ssh/--user=damowang-whostname----user=damowang-W  whoamiHost1:damowang

Clush is a tool for encapsulation based on SSH and SCP commands, the default SSH port if not 22, you need to specify the port number when executing the Clush command

-o-p2222 (capital P) required for file transfer
-o-p2222 (lowercase p) required for bulk execution of OPERATION commands

[Email protected] mywife]# Clush-w host1-o-p2222-c./mingming.host1--dest/root/-w host1 -o-p2222  ls /root/host1:anaconda-Ks.cfghost1:DNS. SH Host1:master. Zip Host1:mingminghost1:mingming.host1host1:mywifehost1:vimhost1:vim-master

Lightweight cluster management software-clustershell