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Alexey Zalesny alces

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alces / gitlab_common_prefix.md
Last active September 18, 2015 14:45
A memo on how to put all the installation of gitlab into a common root (e.g. for running a high-available solution on top of DRBD filesystem).

Putting all the Gitlab-related files into one directory prefix

  1. stop gitlab:
gitlab-ctl stop
  1. move /var/opt/gitlab inside our prefix:
@alces
alces / tomcat.sh
Last active September 21, 2015 11:05
RHEL 5/6-compliant init script for Apache Tomcat
#!/bin/bash
# chkconfig: 345 98 02
export CATALINA_BASE=/opt/tomcat
export CATALINA_HOME=/opt/apache-tomcat-8.0.22
export CATALINA_OPTS="-server -Xms512m -Xmx512m -XX:MaxPermSize=128m -XX:PermSize=128m"
export CATALINA_PID=$CATALINA_BASE/work/tomcat.pid
export JAVA_HOME=/opt/jdk1.8.0_51
PATH=/usr/bin:/bin:/usr/sbin:/sbin
@alces
alces / httpd_logrotate.md
Last active October 13, 2015 07:14
logrotate config for apache with rotating by files' size and gathering statistics from the old logs before compressing them.

Put the following into your /etc/logrotate.d/httpd:

# use the standard parameters for error log
/var/log/httpd/error_log {
    missingok
    notifempty
    sharedscripts
    postrotate
	/sbin/service httpd graceful 2> /dev/null || true
@alces
alces / leaving_only_one_subdirectory_in_git_repo.md
Created October 28, 2015 15:18
How to leave only one sub-directory in a git repository

The following command leaves only content of my/sub/dir in a master branch:

git filter-branch --subdirectory-filter my/sub/dir --prune-empty master

as a side effect, my/sub/dir becomes a root directory of a repository.

Full documentation on git filter-branch command could be found here: https://git-scm.com/docs/git-filter-branch

@alces
alces / using_jenkins_git_plugin_over_https_with_incorect_certificate.md
Last active November 9, 2015 07:31
A short instruction on what to touch in Java and git installations in order to make Jenkins Git plugin work via HTTPS with an SSL certificate seeming somewhat incorrect

How to Make Jenkins Git Plugin Work via HTTPS with "Incorrect" SSL Certificate

If your Jenkins server works with the git server via HTTPS and the latter uses a self-signed (or might be seeming incorect in some other sense) SSL certificate, you'll likely get an error like this:

hudson.plugins.git.GitException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

In order to get rid of it the steps bellow could be helpful (at least, they were helpful for me while setting up Jenkins build nodes on both Linux and Windows boxes):

  1. determine JAVA_HOME of JVM your build node is run by. If there're multiple Java installations on your build server (and I think, that's a common case for such sort of servers),
@alces
alces / process_owner_by_pid.md
Last active November 9, 2015 11:03
How to show a name of user a process with a given PID runs on behalf of

In order to see a name of user starting a process with a given PID the command bellow could be helpful:

ps ho user -p `cat /some/pid/file`

Entering a dash before h argument doesn't work on Linux with the following error message:

Warning: bad syntax, perhaps a bogus '-'?
@alces
alces / find_hosts_in_ad.py
Created November 12, 2015 12:33
A script searching for computers in AD by names' wildcard
# get a list of hosts with names matching a wildcard from AD
# on RedHat-based systems python-ldap package is required
import ldap
# get a field from ldap results
res_field = lambda r, n: r[1][n][0]
# send search query to ldap and get a result
ldap_search = lambda ldap_srv, wld_card: ldap_srv.search_s('ou=servers,dc=example,dc=com',
@alces
alces / listJenkinsUsersPermissions.groovy
Created November 16, 2015 12:54
A groovy script listed all permissions a given user has on Jenkins jobs
USERNAME = 'testuser'
import hudson.model.Hudson
import hudson.security.AuthorizationMatrixProperty
println Hudson.instance.items.collect {
[name: it.name, matrix: it.getProperty(AuthorizationMatrixProperty.class)]
}.findAll {
it.matrix
}.collect {
@alces
alces / listJenkinsGlobalPermission.groovy
Created November 17, 2015 08:19
Extract list of global permissions a particular user has from Jenkins' config.xml
USERNAME = 'dummy'
import hudson.model.Hudson
println new XmlSlurper().parse(
new File(Hudson.instance.root, 'config.xml')
).authorizationStrategy.permission.collect {
it.text().split(':')
}.findAll {
it[1] == USERNAME
@alces
alces / ansible_python_hacks.yml
Last active December 25, 2015 08:02
Some examples of Pythonic ways of working with Ansible variables
#!/usr/bin/env ansible-playbook
---
- name: Learn about some Pythonic ways to work with Ansible variables
hosts: all
vars:
env_name: prod
java_root: /opt
jdk_ver: 1.8.0_51
rhel_major_version: 7
linux_distros: