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This article introduces how Saltstack manages files and plans tasks in batches. The content is very detailed. Interested friends can refer to it for reference. I hope it can help you.

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saltstack is an open source project created by thomas Hatch and designed to implement a fast remote execution system. To manage your infrastructure, easily manage thousands of servers.

More about saltstack This article doesn't cover much, but mainly demonstrates using saltstack to manage server files (such as/etc/hosts,/etc/resolv.conf) and schedule tasks.

usage scenarios

When maintaining a large number of servers, after the system is initialized and online, we hope that some configuration files of all server systems are the same. At this time, we need a tool to manage these files in batches to ensure the consistency of configuration files, such as: /etc/resolv.conf file. We would like this document to be uniform at all times. Next, we will demonstrate this function through saltstack

Environmental preparation

You need to install salt-master salt-minion, and use test.ping module to check minion on master, as shown below

[root@saltmaster001 salt] salt 'qd01-stop-free002*' test.ping qd01-stop-free002: True

configure master

Modify/etc/salt/master to add the following

file_roots: base: - /srv/salt pillar_roots: base: - /srv/pillar pillar_opts: True

Writing sls files

1. Switch to the/srv/salt directory. We create a new sysinit directory, which is mainly used to manage some configuration files of the system.

2. cd sysinit, create conf, scripts directory, and create sysinit.sls file

[root@saltmaster001 sysinit]# ll total 4 drwxr-xr-x 2 root root 191 Dec 31 11:48 conf drwxr-xr-x 2 root root 198 Dec 14 12:41 scripts -rw-r--r-- 1 root root 3107 Dec 31 11:49 sysinit.sls

Description:

The conf directory mainly stores configuration files, such as hosts,resolv.conf and other configuration files.

scripts directory mainly stores script files, such as system environment monitoring script check_server_env.sh written by yourself.

3. Write sysinit.sls

/opt/resolv.conf: file.managed: - source: salt://sysinit/conf/resolv.conf - user: root - group: root - mode: 644 - replaceTrue: True

As shown above, the file module of salt is mainly used here.

/opt/resolv.conf： Indicates the directory where the configuration file to be managed is located (minion side) Here, it means to synchronize the master's salt://sysinit/conf/resolv.conf to the minion side's/opt/resolv.conf source: the file's source path user: the file belongs to user group: the file belongs to group mode: the file permissions replaceTrue : Force file and master to be consistent

Create top.sls in/srv/salt

base: '*': - sysinit.sysinit

The above code indicates that the sysinit.sls file in the sysinit directory will be executed by salt and the target is all minion terminals.

The configuration files and sls files required above are all written. Next, let's execute and see the effect.

5. Perform synchronization

I have only one server qd01-stop-free002 in minion here. Look at the opt directory first. There is no resolv.conf file now.

[root@qd01-stop-free002 opt]# ll total 8 drwxr-xr-x 4 root root 4096 Jul 13 2017 dell drwxr-xr-x 10 root root 4096 Mar 26 2019 gitlab

manual synchronization

[root@saltmaster001 salt]# salt 'qd01-stop-free002' state.apply sysinit.sysinit qd01-stop-free002: ---------- ID: /opt/resolv.conf Function: file.managed Result: True Comment: File /opt/resolv.conf updated Started: 15:31:17.355667 Duration: 52.986 ms Changes: ---------- diff: New file mode: 0644

Now look at the/opt directory of qd01-stop-free002, there is already a resolv.conf file

[root@qd01-stop-free002 opt]# ll total 12 drwxr-xr-x 4 root root 4096 Jul 13 2017 dell drwxr-xr-x 10 root root 4096 Mar 26 2019 gitlab -rw-r--r-- 1 root root 103 Jan 6 15:34 resolv.conf

Now you can see that although the minion side has synchronized the files on the master side, this is the synchronization we performed manually. If we need to check this regularly, we need to use the salt schedule.

6. Configuration schedule

Schedule can be configured to master or minion, this article is configured to master

Modify the/etc/salt/master file to add the following

##### schedule ##### schedule: sysinit: function: state.orchestrate seconds: 0 minutes: 5 hours: 0 args: - orchestration.sysinit.sysinit

Description:

Use salt's state.orchestrate function, minutes: 5 means to check every five minutes args means to execute sls, here sysinit.sysinit, from the structure you can see that it is/srv/salt/sysinit/sysinit.sls file. Watch carefully and you will know the structure.

After configuring me, you need to restart salt-master

[root@altmaster001 salt]# systemctl restart salt-master

Remove/opt/resolv.conf from qd01-stop-free002 again, observe after 5 minutes,/opt/resolv.conf is back.

This demonstrates how to use salt to automatically manage remote server profiles. If you need to manage multiple configuration files, just modify the sysinit.sls file, for example

/opt/resolv.conf: file.managed: - source: salt://sysinit/conf/resolv.conf - user: root - group: root - mode: 644 - replaceTrue: True /root/.ssh/authorized_keys: file.managed: - source: salt://sysinit/conf/authorized_keys - user: root - group: root - mode: 0600 - replaceTrue: True

Manage cron tasks

1. As with the administrative configuration file, we also modify the sysinit.sls file, but here we use the cron module of salt.

root_crontab_job1: cron.present: - name: sh /home/ntp.sh >> /tmp/ntp.log - minute: "00" - hour: "*/2" - identifier: NTP

Description:

cron.present: salt module

name: task statement, consistent with cron task of system

minutes, hours, days, months, weeks refer to crontab

identifier: task identifier

After modifying sysinit.sls, we save the exit, because we have configured the synchronization sls task to be executed automatically. Check crontab -l on qd01-stop-free002 machine in five minutes

# Lines below here are managed by Salt, do not edit # SALT_CRON_IDENTIFIER:NTP 00 */2 * * sh /home/ntp.sh>> /tmp/ntp.log About Saltstack how to batch manage files and schedule tasks to share here, I hope the above content can be of some help to everyone, you can learn more knowledge. If you think the article is good, you can share it so that more people can see it.

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