Tag Archives: Linux

Linux

Linux – Preserve Environment Variables when using sudo

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Sometimes we may want to preserve the environment variables of the original user when using sudo.

If you want to preserve all env variables, you could use the -E option. But use it with caution.

sudo -E bash -c 'echo $PATH'

 

A better approach is to list those env variables which u want to preserve in the sudoers config file. For example, i want to keep the HTTP_PROXY and HTTPS_PROXY.

Defaults env_keep +="HTTP_PROXY"
Defaults env_keep +="HTTPS_PROXY"

 

So every time you use the sudo command, the HTTP_PROXY and HTTPS_PROXY are kept.

Done =)

Reference:

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Linux, Monitoring

collectd – Cannot send out matrics

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collectd is a statistics gathering tools which helps system admin to analysis the system conditions. It includes both server and client implementations. The collectd client send metrics to the collectd server.

 

I installed the collectd on a CentOS 7 machine and try to send the metrics to a Graphite instance. But no matter how i changed the setup, the Graphite couldn’t receive any data. Finally, i realized that it is blocked by the SELinux policy.
Continue reading collectd – Cannot send out matrics →

Continuous Integration

Artifactory – Upload artifact through command line

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Jenkins works well with Artifactory and the built artifact will be upload to the Artifactory repository automatically.

One day, i found that the artifact is built but it is not uploaded. The Linux server doesn’t have the desktop interface so i couldn’t upload the artifact through browser. An alternative way is to use the curl command to post the artifact to the repository.

curl -X POST <target url> --data <artifact>

 

Example:

curl -X POST http://localhost:8081/artifactory/dev-snapshot-local/eureka-v0.0.1.tar.gz --data eureka-v0.0.1.tar.gz

 

Done =)

Reference: StackOverflow – How do I deploy a file to Artifactory using the command line

Django

Django – Schedule django-admin command using django-chronograph

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Previously we talked about setting up some custom command in a Django project.

 

I would like to run the custom command in a regular interval. I could use Linux cronjob but it’s hard to manage and check the run history. It would be great if i could setup and manage these scheduled commands on the Django web portal.

django-chronograph, written by wnielson, is a Python Package which allows us to schedule any django-admin command through the web interface. It works well with the UTC timezone but if you have set the TIME_ZONE in your Django project setting.py, there would be time discrepancy.

For more detail about the bug, you can refer to the Issue #36 – Job doesn’t follow the Django’s TIME_ZONE setting.
Continue reading Django – Schedule django-admin command using django-chronograph →

Monitoring

Install Graphite under pyenv virtualenv on Ubuntu

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It took me one and an half day to get the Graphite working…

1. Make sure you have pyenv and pyenv-virtualenv installed.

 

2. Install the following packages.

sudo apt-get install python-dev pkg-config libcairo2-dev memcached

 

3. Install Python 2.7 with enable-shared.

env PYTHON_CONFIGURE_OPTS="--enable-shared" pyenv install 2.7.8

Continue reading Install Graphite under pyenv virtualenv on Ubuntu →

Linux, Monitoring

Ubuntu – Install Monit

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Monit is a opensource monitoring tool on Unix system. The simplest use case would be restarting your service if there is failure.

On Ubuntu, simply run apt-get to install Monit.

sudo apt-get install monit

 

The Monit folder is at /etc/monit. Before you can read anything from Monit, create the /etc/monit/conf.d/monit.conf in order to setup the Monit web interface.

set httpd port 2812 and
  use address localhost
  allow localhost

Continue reading Ubuntu – Install Monit →

Puppet

Housekeeping Puppet Master

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Yesterday i used a Puppet master as an example to talk about purging old files on Linux.

Of course we can setup a cron job and run the shell command daily for housekeeping. But as we are using Puppet, we don’t we do that thru Puppet manifest?

tidy { 'puppet::reports':
  path => '/var/lib/puppet/reports',
  matches => '*.yaml',
  age => '14d',
  backup => false,
  recurse => true,
  rmdirs => false,
  type => 'ctime',
}

 

The above tidy type will delete those .yaml which is older than 14 days.

Done =)

Reference: Google Groups – Purge puppet’s reports