In a cluster of now manage thousands of Linuxmachine became a problem, can no longer use one a login host to manage the workload is undoubtedly very great, here we can help Clustershellwith the psshmanagement, it is the principle of automatic Login hosts in the cluster will help us execute scripts, or file operations, etc., had a big pig is one to manage, and one word: tired Yeah.

user's guidance

Clustershell Tools

Centos7 is used as the operation, we only need to complete all of the configuration of the machine in a cluster on a single host

master      host.com        #主机
cluster1    2.host.com      #节点1
cluster2    3.host.com      #节点2
cluster3    4.host.com      #节点3

Free Password

1,2,3 host using ssh to log node must be password-free login , and can not log in for the first time, because Clustershellnot automatically enter interactive commands, such as the following will host the first login prompt.

ssh [email protected]

The authenticity of host '2.host.com (192.168.0.20)' can't be established.
ECDSA key fingerprint is d4:5d:d6:e6:bc:70:86:1b:42:32:aa:6b:86:a6:34:d4.
Are you sure you want to continue connecting (yes/no)?

ClustershellCan not automatically process will prompt the following error

[1] 11:32:17 [FAILURE] 2.host.com Exited with error code 255

Key generation

ssh-keygen -t rsa

Copy the contents of the public key to each node

scp ~/.ssh/id_rsa.pub 192.168.0.20:/root/.ssh/authorized_keys
scp ~/.ssh/id_rsa.pub 192.168.0.21:/root/.ssh/authorized_keys
scp ~/.ssh/id_rsa.pub 192.168.0.22:/root/.ssh/authorized_keys

Configuration ClusterShell

vim /etc/clustershell/groups.d/local.cfg

Follows

# ClusterShell groups config local.cfg
#
# Replace /etc/clustershell/groups
#
# Note: file auto-loaded unless /etc/clustershell/groups is present
#
# See also groups.d/cluster.yaml.example for an example of multiple
# sources single flat file setup using YAML syntax.
#
# Feel free to edit to fit your needs.
adm: example0
oss: example4 example5
mds: example6
io: example[4-6]
compute: example[32-159]
gpu: example[156-159]
all: example[4-6,32-159]
demo: [1-3].host.com

Above we define a group: demo, by connecting this packet can 1.host.com, 2.host.com, 3.host.com, if this three to pull the node corresponding IP connection failure is not mapped, may be provided / etc / hosts correspondence relationship

cat /etc/hosts

127.0.0.1 localhost
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.0.20 1.host.com
192.168.0.21 2.host.com
192.168.0.22 3.host.com

clush command several important parameters

-b: Merge same output
-w: Specifies the node
-a: all nodes
-g: Specifies the group
--copy: Bulk file

Each node executes lsthe command

clush -g demo "ls"

Create a file

clush -g demo "touch /root/demo.txt"

Bulk file

clush -g demo --copy groups --dest /root

pssh Tools

installation

yum install pssh -y

Edit IP node to pull
vim /root/hosts.txt

1.host.com
2.host.com
3.host.com

Node executes the command

pssh -H hosts.txt -P "ls"

Clustershell - million units Linux management