VIFIB DESCENTRALIZED CLOUD COMPUTING

SlapOS is a decentralized Cloud Computing technology that can automate the deployment and configuration of applications in a heterogeneous environment.

Agenda

  • Prerequisite
  • Add Logrotate entry
  • Verification

A production generate a lot of logs, it is necessary to rotate said logs. Logrotate is the main tool in SlapOS.

This tutorial explains how to add a logrotate entry inside the instances of your software release for remote monitoring.

Here are the commits introducing this functionality to html5as Software release: commit diff

Prerequisite

Add Logrotate entry

In instance_html5as.cfg.in, add a logrotate entry for Nginx logs. Note the we use the post command as recommended in Nginx documentation to reopen log after rotation.

Log rotation can be further customized, you can check the list of parameter in instance-logrotate-base.cfg.in

# Monitor Stack also provides logrotate stack. We only need to extend
# the logrotate-entry-base defined in instance-logrotate-base.cfg.in .
# More parameters can be added following the logrotate-entry-base section
[logrotate-entry-nginx]
<= logrotate-entry-base
name = nginx
log = ${html5as:path_access_log} ${html5as:path_error_log}
post = kill -USR1 $(cat ${html5as:path_pid})

Process logrotate entry

Add the new section to the list of parts to be processed in instance_html5as.cfg.in

[buildout]
parts =
    ...
    logrotate-entry-nginx
    ...

Update md5sums

Refer How To Move to md5sum automatic update to update md5sum:

$ cd ~/srv/project/slapos/software/html5as-base
$ ../../update-hash

Validation

  1. Inspect the logs
  2. Verify the content in logrotate.d directory

Compile and Instantiate

Re-compile the software by

$ slapos node software --all

Once it completes, you may re-instantiate it by

$ slapos node instance --all

Check the output to make sure it has been deployed and installed.

Verify the content in logrotate.d/

Change directory:

$ cd ~/srv/runner/instance/slappart0/

List the content in logrotate.d/

$ ls etc/logrotate.d/

The content inside will be:

crond monitor-apache monitor.data monitor.service.status nginx

You are also able to browser EXPLORER to locate logrotate.d directory.

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