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< li > < a class = "reference internal" href = "#" > Command Line Examples< / a > < ul >
< li > < a class = "reference internal" href = "#parallelism-and-shell-commands" > Parallelism and Shell Commands< / a > < / li >
< li > < a class = "reference internal" href = "#file-transfer-templating" > File Transfer & Templating< / a > < / li >
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< div class = "section" id = "command-line-examples" >
< h1 > Command Line Examples< a class = "headerlink" href = "#command-line-examples" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > The following examples show how to use < cite > /usr/bin/ansible< / cite > for running ad-hoc tasks.
Start here. For configuration management and deployments, you’ ll want to pick up on
using < cite > /usr/bin/ansible-playbook< / cite > – the concepts port over directly.< / p >
< div class = "section" id = "parallelism-and-shell-commands" >
< h2 > Parallelism and Shell Commands< a class = "headerlink" href = "#parallelism-and-shell-commands" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Let’ s use ansible’ s command line tool to reboot all web servers in Atlanta, 10 at a time:< / p >
< div class = "highlight-python" > < pre > ssh-agent bash
ssh-add ~/.ssh/id_rsa.pub
ansible atlanta -a "/sbin/reboot" -f 10< / pre >
< / div >
< p > The -f 10 specifies the usage of 10 simultaneous processes.< / p >
< div class = "admonition note" >
< p class = "first admonition-title" > Note< / p >
< p class = "last" > -m does not always have to be specified to /usr/bin/ansible because ‘ command’ is the default ansible module< / p >
< / div >
< p > If we want to execute a module using the shell, we can avoid using absolute paths, and can also include
pipe and redirection operators. Read more about the differences on the < em class = "xref std std-ref" > modules< / em > page. The shell
module looks like this:< / p >
< div class = "highlight-python" > < pre > ansible raleigh -m shell -a "echo \\$TERM"< / pre >
< / div >
< div class = "admonition note" >
< p class = "first admonition-title" > Note< / p >
< p class = "last" > When using ansible to run commands, and in particular the shell module, be careful of shell quoting rules.< / p >
< / div >
< div class = "admonition note" >
< p class = "first admonition-title" > Note< / p >
< p class = "last" > Note that other than the command < em class = "xref std std-ref" > modules< / em > , ansible modules usually do
not work like simple scripts. They make the remote system look like
you state, and run the commands necessary to get it there. This
is commonly referred to as ‘ idempotence’ , and is a core design goal of ansible. However, we also
recognize that running ad-hoc commands is equally imporant, so Ansible easily supports both.< / p >
< / div >
< / div >
< div class = "section" id = "file-transfer-templating" >
< h2 > File Transfer & Templating< a class = "headerlink" href = "#file-transfer-templating" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Ansible can SCP lots of files to multiple machines in parallel, and
optionally use them as template sources.< / p >
< p > To just transfer a file directly to many different servers:< / p >
< div class = "highlight-python" > < pre > ansible atlanta -m copy -a "src=/etc/hosts dest=/tmp/hosts"< / pre >
< / div >
< p > To use templating, first run the setup module to put the template
variables you would like to use on the remote host. Then use the
template module to write the files using those templates.< / p >
< p > Templates are written in Jinja2 format. Playbooks (covered elsewhere in the
documentation) will run the setup module for you, making this even
simpler:< / p >
< div class = "highlight-python" > < pre > ansible webservers -m setup -a "favcolor=red ntp_server=192.168.1.1"
ansible webservers -m template -a "src=/srv/motd.j2 dest=/etc/motd"
ansible webservers -m template -a "src=/srv/ntp.j2 dest=/etc/ntp.conf"< / pre >
< / div >
< p > Ansible variables are used in templates by using the name surrounded by double
curly-braces. If facter or ohai were installed on the remote machine, variables
from those programs can be accessed too, which the appropriate prefix:< / p >
< div class = "highlight-python" > < pre > This is an Ansible variable: {{ favcolor }}
This is a facter variable: {{ facter_hostname }}
This is an ohai variable: {{ ohai_foo }}< / pre >
< / div >
< p > The < cite > file< / cite > module allows changing ownership and permissions on files. These
same options can be passed directly to the < cite > copy< / cite > or < cite > template< / cite > modules as well:< / p >
< div class = "highlight-python" > < pre > ansible webservers -m file -a "dest=/srv/foo/a.txt mode=600"
ansible webservers -m file -a "dest=/srv/foo/b.txt mode=600 owner=mdehaan group=mdehaan"< / pre >
< / div >
< p > The < cite > file< / cite > module can also create directories, similar to < cite > mkdir -p< / cite > :< / p >
< div class = "highlight-python" > < pre > ansible webservers -m file -a "dest=/path/to/c mode=644 owner=mdehaan group=mdehaan state=directory"< / pre >
< / div >
< p > As well as delete directories (recursively) and delete files:< / p >
< div class = "highlight-python" > < pre > ansible webservers -m file -a "dest=/path/to/c state=absent"< / pre >
< / div >
< p > The mode, owner, and group arguments can also be used on the copy or template lines.< / p >
< / div >
< div class = "section" id = "managing-packages" >
< h2 > Managing Packages< a class = "headerlink" href = "#managing-packages" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Ensure a package is installed, but don’ t update it:< / p >
< div class = "highlight-python" > < pre > ansible webservers -m yum -a "pkg=acme state=installed"< / pre >
< / div >
< p > Ensure a package is installed to a specific version:< / p >
< div class = "highlight-python" > < pre > ansible-webservers -m yum -a "pkg=acme-1.5 state=installed"< / pre >
< / div >
< p > Ensure a package is at the latest version:< / p >
< div class = "highlight-python" > < pre > ansible webservers -m yum -a "pkg=acme state=latest"< / pre >
< / div >
< p > Ensure a package is not installed:< / p >
< div class = "highlight-python" > < pre > ansible-webservers -m yum -a "pkg=acme state=removed"< / pre >
< / div >
< p > Currently Ansible only has a module for managing packages with yum. You can install
for other package manages using the command module or contribute a module
for other package managers. Stop by the mailing list for info/details.< / p >
< / div >
< div class = "section" id = "deploying-from-source-control" >
< h2 > Deploying From Source Control< a class = "headerlink" href = "#deploying-from-source-control" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Deploy your webapp straight from git:< / p >
< div class = "highlight-python" > < pre > ansible webservers -m git -a "repo=git://foo dest=/srv/myapp version=HEAD"< / pre >
< / div >
< p > Since ansible modules can notify change handlers (see
< a class = "reference internal" href = "playbooks.html" > < em > Playbooks< / em > < / a > ) it is possible to tell ansible to run specific tasks
when the code is updated, such as deploying Perl/Python/PHP/Ruby
directly from git and then restarting apache.< / p >
< / div >
< div class = "section" id = "managing-services" >
< h2 > Managing Services< a class = "headerlink" href = "#managing-services" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Ensure a service is started on all webservers:< / p >
< div class = "highlight-python" > < pre > ansible webservers -m service -a "name=httpd state=started"< / pre >
< / div >
< p > Alternatively, restart a service on all webservers:< / p >
< div class = "highlight-python" > < pre > ansible webservers -m service -a "name=httpd state=restarted"< / pre >
< / div >
< p > Ensure a service is stopped:< / p >
< div class = "highlight-python" > < pre > ansible webservers -m service -a "name=httpd state=stopped"< / pre >
< / div >
< / div >
< div class = "section" id = "time-limited-background-operations" >
< h2 > Time Limited Background Operations< a class = "headerlink" href = "#time-limited-background-operations" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Long running operations can be backgrounded, and their status can be
checked on later. The same job ID is given to the same task on all
hosts, so you won’ t lose track. If you kick hosts and don’ t want
to poll, it looks like this:< / p >
< div class = "highlight-python" > < pre > ansible all -B 3600 -a "/usr/bin/long_running_operation --do-stuff"< / pre >
< / div >
< p > If you do decide you want to check on the job status later, you can:< / p >
< div class = "highlight-python" > < pre > ansible all -m async_status -a "jid=123456789"< / pre >
< / div >
< p > Polling is built-in and looks like this:< / p >
< div class = "highlight-python" > < pre > ansible all -B 3600 -P 60 -a "/usr/bin/long_running_operation --do-stuff"< / pre >
< / div >
< p > The above example says “ run for 60 minutes max (60*60=3600), poll for status every 60 seconds” .< / p >
< p > Poll mode is smart so all jobs will be started before polling will begin on any machine.
Be sure to use a high enough < cite > – forks< / cite > value if you want to get all of your jobs started
very quickly. After the time limit (in seconds) runs out (< tt class = "docutils literal" > < span class = "pre" > -B< / span > < / tt > ), the process on
the remote nodes will be terminated.< / p >
< p > Any module other than < a class = "reference internal" href = "modules.html#copy" > < em > copy< / em > < / a > or < a class = "reference internal" href = "modules.html#template" > < em > template< / em > < / a > can be
backgrounded. Typically you’ ll be backgrounding long-running
shell commands or software upgrades only. ref:< cite > playbooks< / cite > also support polling, and have
a simplified syntax for this.< / p >
< div class = "admonition-see-also admonition seealso" >
< p class = "first admonition-title" > See also< / p >
< dl class = "last docutils" >
< dt > < a class = "reference internal" href = "modules.html" > < em > Ansible Modules< / em > < / a > < / dt >
< dd > A list of available modules< / dd >
< dt > < a class = "reference internal" href = "playbooks.html" > < em > Playbooks< / em > < / a > < / dt >
< dd > Using ansible for configuration management & deployment< / dd >
< dt > < a class = "reference external" href = "http://groups.google.com/group/ansible-project" > Mailing List< / a > < / dt >
< dd > Questions? Help? Ideas? Stop by the list on Google Groups< / dd >
< dt > < a class = "reference external" href = "http://irc.freenode.net" > irc.freenode.net< / a > < / dt >
< dd > #ansible IRC chat channel< / dd >
< / dl >
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< p >
© Copyright 2012 Michael DeHaan.< br / >
Last updated on Mar 17, 2012.< br / >
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