Install package

sudo apt install keyword

Search cache

apt-cache search keyword

File installed package location

sudo apt content keyword

Dependencies

sudo apt depends keyword

Search for a package

sudo apt search keyword

Show package info

sudo apt show keyword

Verify a package

sudo apt check keyword

List recommended missing packages of given package

sudo apt recommends keyword

Check package version

sudo apt version keyword

ToDo List

• Environment Variables
  • https://www.digitalocean.com/community/tutorials/how-to-read-and-set-environmental-and-shell-variables-on-a-linux-vps
• C++ Compile Test
  • https://www.scalescale.com/tips/nginx/install-gcc-development-tools-centos-7/#

alternatives --help

alternatives version 1.7.4 - Copyright (C) 2001 Red Hat, Inc.
This may be freely redistributed under the terms of the GNU Public License.

Managing Users & Roles

Default Logic

• Before Roles are Created, ALL users are admin
• Need Role Strategy Plugin to create/manage 'Roles'
  •  
• Create Roles, then assign users to lock system down
• Manage Jenkins > Manage Users > Create User
• API Token
• User must login to view the API Token ( for REST calls to Jenkins )

Role Strategy Plugin

Manual Installation

Download Manually

• https://wiki.jenkins.io/display/JENKINS/Role+Strategy+Plugin
• https://github.com/jenkinsci/role-strategy-plugin
• *.hpi file

cd /var/lib/jenkins/plugins
wget --no-cookies "https://updates.jenkins.io/download/plugins/role-strategy/2.8.1/role-strategy.hpi"
systemctl restart jenkins

Jenkins CLI

WHY

• CLI uses less memory
• Continuous Integration Hooks

Configure Global Security

• Manage Jenkins > Configure Global Security > Enable security = Yes
• <ip>::8080/cli
• You can access various features in Jenkins through a command-line tool. See the documentation for more details of this feature.To get started, download jenkins-cli.jar, and run it as follows
• java -jar jenkins-cli.jar -s http://192.168.0.103:8080/ help
•  
• Copy jenkins-cli.jar
  • FROM

/var/cache/jenkins/war/WEB-INF/jenkins-cli.jar

• TO

/usr/lib/jenkins/

Changing Deployment Location

• http://192.168.0.103:8080/configure
• var/lib/jenkins
  • Copy ALL data to NEW location
• /etc/sysconfig/jenkins
  • Change env variable JENKINS_HOME
    • OR
    • export JENKINS_HOME=<path>
  • Change other paths
• etc/init.d/jenkins
  • update paths
• /home/<user>/.bash_profile
  • update PATH
• systemctl restart jenkins
• • OR
  • <ip>:8080/restart
• <ip>:8080/systemInfo

Basic Deployment Locations

/etc/init.d/jenkins

# Check for missing binaries (stale symlinks should not happen)

JENKINS_WAR="/usr/lib/jenkins/jenkins.war"

# Check for existence of needed config file and read it
JENKINS_CONFIG=/etc/sysconfig/jenkins

JENKINS_PID_FILE="/var/run/jenkins.pid"

# Source function library.
.

alternatives

Link: https://serverfault.com/questions/838592/how-to-remove-update-alternatives-links-on-linux

• Links stored in

/var/lib/alternatives

--install

alternatives --install <link> <name> <path> <priority>

• <link> = fake path
• <name> = identifier for keeping the alternative links
• <path> = REAL path
• <priority> = int representing

Deploying Jenkins on CentOS7 ( jetty/winstone )

• https://jenkins.io/doc/
• https://jenkins.io/download/
• https://pkg.jenkins.io/redhat-stable/

Install Folders

• /var/lib/jenkins - filesystem
• /usr/lib/jenkins - jenkins.war
• /etc/init.d/jenkins - init & config

Finding Packages with Yum

sudo -c 'yum list wget'

Pull Jenkins Repo

• Pull jenkins repo

sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo

• Get key for to validate the jenkins package

sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key