How Linux systems Install and configure the Clustershell tool to understand load conditions

Source: Internet
Author: User
Tags ssh

Linux system if you want to understand the load between multiple database servers, then you will use the Clustershell tools, as a Linux operation tool, its installation and configuration is also a learning, then on Linux to install and configure Clustershell?

 Installation and configuration of Clustershell

Clustershell installation is easy, if the use of apt or yum package management, the basic is a command of things, I will not say, here to say how to install from the source code, you need to execute the following command in the source code directory:

Shell "Python setup.py Install

For ease of use, you will also need to copy the configuration files to the specified directory:

Shell "Mkdir/etc/clustershell

Shell "CP conf/*/etc/clustershell

Then configure the node we want to manage, assuming we have a DB group configured with Db_[1-3] three nodes:

Shell "Cat/etc/clustershell/groups

Db:db_1 db_2 Db_3

Be ready to query the current load on all database servers:

Shell Clush-b-G db "uptime"

Note: The prerequisite is that you need to set the password-free login on the operating server, if not clear, please see the following content.

How do I configure the server for password-free logons?

If you do not generate the SSH key in advance, you need to be Mr.:

Shell "Ssh-keygen

Optional operation: For convenience, we can give the server that needs to log in a better readability alias, if you do a similar operation, then the later "USER" @ "server" can be replaced by the corresponding "HOST":

Shell "Cat ~/.ssh/config

Host db_1

Hostname "The SERVER"

User "user"

Port "Port"

Host db_2

Hostname "The SERVER"

User "user"

Port "Port"

Host Db_3

Hostname "The SERVER"

User "user"

Port "Port"

The generated public key is then added to the specified location of the server where the login is required:

Shell Cat ~/.ssh/id_rsa.pub | SSH "USER" @ "SERVER" "Cat-" "~/.ssh/authorized_keys"

If you can't remember how to spell Authorized_keys correctly, you can go on to learn how to use Ssh-copy-id, a command that makes it easier to do things:

Shell "Ssh-copy-id-i ~/.ssh/id_rsa.pub" "USER" @ "SERVER"

Note: Each configured a password-free login server, it is best to manually actually operate, because the first connection will require manual confirmation of whether to save information to the ~/.ssh/known_hosts file.

The above is the Linux installation configuration Clustershell method introduced, because the Clustershell installation configuration requires password-free logon server, so this article also made a related explanation.

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