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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 >
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< 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 >
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< dt > < a class = "reference internal" href = "playbooks.html" > < em > Playbooks< / em > < / a > < / dt >
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< dd > Alternative ways to use ansible< / dd >
< / dl >
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< / div >
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< 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 >
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< p > Let’ s use ansible’ s command line tool to reboot all web servers in Atlanta, 10 at a time:< / p >
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< 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 >
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< div class = "admonition note" >
< p class = "first admonition-title" > Note< / p >
< p class = "last" > Note that other than the < a class = "reference internal" href = "modules.html#command" > < em > command< / em > < / a > module, ansible modules 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 ‘ idempotent’ .< / p >
< / div >
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< / div >
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< 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 >
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< p > Ansible can SCP lots of files to multiple machines in parallel, and
optionally use them as template sources.< / p >
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< p > To just transfer a file directly to many different servers:< / p >
< div class = "highlight-python" > < pre > ansible atlanta copy -a "/etc/hosts /tmp/hosts"< / pre >
< / div >
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< 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 the templates. Templates are
written in Jinja2 format. Playbooks (covered elsewhere in the
documentation) will run the setup module for you, making this even
simpler.:< / p >
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< 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 >
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< / div >
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< p > Need something like the fqdn in a template? If facter or ohai are
installed, data from these projects will also be made available to the
template engine, using ‘ facter’ and ‘ ohai’ prefixes for each.< / p >
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< / div >
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< 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 >
< blockquote >
< div > ansible-webservers -m yum -a “ pkg=acme state=removed” < / div > < / blockquote >
< 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 >
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< 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 >
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< 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 >
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< / div >
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< 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 >
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< / div >
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< 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 >
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< div class = "highlight-python" > < pre > ansible webservers -m service -a "name=httpd state=started"< / pre >
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< / div >
< p > Alternatively, restart a service on all webservers:< / p >
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< 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 >
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< / div >
< / div >
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< 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 >
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< 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. Polling support is pending in the
command line.:< / p >
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< div class = "highlight-python" > < pre > ansible all -B 3600 -a "/usr/bin/long_running_operation --do-stuff"
ansible all -n job_status -a jid=123456789< / pre >
< / div >
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< 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 shell commands or
software upgrades only.< / p >
< p > 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 killed.< / p >
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© Copyright 2012 Michael DeHaan.< br / >
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Last updated on Mar 10, 2012.< br / >
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