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= LAB OBJECTIVES =
:1. Use the '''fab''' program to execute administrative tasks via Python functions under the '''Fabric''' framework on remote system.:2. Create python functions using Fabric API to perform Linux system administrative tasks. == Overview ==:Completing this course lab will give you the prerequisites for getting into the DevOps field. A DevOps professional a taste of what is a involve in automating remote system/network administrator with programming skillsadministration task. As an introduction to that field, we We will look at '''Fabric''' in this lab. Using Fabric you can automate monitoring, deploying software, and updating many systems at the same time.
== REFERENCE ==
= INVESTIGATION 1: Extra VM Setup =
: In order to experience Fabric's features in a realistic way, we're going to set up several virtual machines(You need at least one more VM). To begin with they are all going to have the same configuration. Please make sure that each VM has direct network connect with other VMs you wish to control and configure.
== PART 1 - Set up your controller ==
: In this lab you will use your existing vm '''centos7''' as a workstation to control other VMs which we'll call workers. Later in the lab, we will try to control and monitor your vm in myvmlab using the fabfile we are going to develop.
: Install '''fabric''' using yum. Once it's installed you should have a '''fab''' command available. Type the following command to get the command line option:<source lang='bash'>fab --help</source>You should get something similar to the following:<source lang="bash">Usage: fab [options] <command>[:arg1,arg2=val2,host=foo,hosts='h1;h2',...] ...
Options:
-h, --help show this help message and exit
-d NAME, --display=NAME
print detailed info about command NAME
-F FORMAT, --list-format=FORMAT
formats --list, choices: short, normal, nested
-I, --initial-password-prompt
Force password prompt up-front
--initial-sudo-password-prompt
Force sudo password prompt up-front
-l, --list print list of possible commands and exit
--set=KEY=VALUE,... comma separated KEY=VALUE pairs to set Fab env vars
--shortlist alias for -F short --list
-V, --version show program's version number and exit
-a, --no_agent don't use the running SSH agent
-A, --forward-agent forward local agent to remote end
--abort-on-prompts abort instead of prompting (for password, host, etc)
-c PATH, --config=PATH
specify location of config file to use
--colorize-errors Color error output
-D, --disable-known-hosts
do not load user known_hosts file
-e, --eagerly-disconnect
disconnect from hosts as soon as possible
-f PATH, --fabfile=PATH
python module file to import, e.g. '../other.py'
-g HOST, --gateway=HOST
gateway host to connect through
--gss-auth Use GSS-API authentication
--gss-deleg Delegate GSS-API client credentials or not
--gss-kex Perform GSS-API Key Exchange and user authentication
--hide=LEVELS comma-separated list of output levels to hide
-H HOSTS, --hosts=HOSTS
comma-separated list of hosts to operate on
-i PATH path to SSH private key file. May be repeated.
-k, --no-keys don't load private key files from ~/.ssh/
--keepalive=N enables a keepalive every N seconds
--linewise print line-by-line instead of byte-by-byte
-n M, --connection-attempts=M
make M attempts to connect before giving up
--no-pty do not use pseudo-terminal in run/sudo
-p PASSWORD, --password=PASSWORD
password for use with authentication and/or sudo
-P, --parallel default to parallel execution method
--port=PORT SSH connection port
-r, --reject-unknown-hosts
reject unknown hosts
--sudo-password=SUDO_PASSWORD
password for use with sudo only
--system-known-hosts=SYSTEM_KNOWN_HOSTS
load system known_hosts file before reading user
known_hosts
-R ROLES, --roles=ROLES
comma-separated list of roles to operate on
-s SHELL, --shell=SHELL
specify a new shell, defaults to '/bin/bash -l -c'
--show=LEVELS comma-separated list of output levels to show
--skip-bad-hosts skip over hosts that can't be reached
--skip-unknown-tasks skip over unknown tasks
--ssh-config-path=PATH
Path to SSH config file
-t N, --timeout=N set connection timeout to N seconds
-T N, --command-timeout=N
set remote command timeout to N seconds
-u USER, --user=USER username to use when connecting to remote hosts
-w, --warn-only warn, instead of abort, when commands fail
-x HOSTS, --exclude-hosts=HOSTS
comma-separated list of hosts to exclude
-z INT, --pool-size=INT
number of concurrent processes to use in parallel mode
</source>
Please note and study the -H, -f, -l, and --port options.
== PART 2 - Create master Worker image ==