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This is the exact opposite of adding a line. Insertbefore: ‘#library’ Remove a line using lineinfile module In the example below, we are adding the same line just before the #library pattern in the Ansible config file. To add a line just before a parameter, use the ‘ insertbefore‘ parameter. Line: 'inventory = /home/linuxtechi/hosts' We have escaped the since they are regex characters. In the playbook below, we are adding a line to specify our preferred inventory file just after the section in the ansible.cfg file. For this, you need to use the insertafter and insertbefore directives. Sometimes, you may want to insert a new line just before or after a section of a file and not always at the end of the line. When the playbook file is run, notice that the new entry or line has been added. The state parameter instructs Ansible to write the line in the file and the create parameter tells Ansible to create the file if it’s not already there. If the line already exists, then Ansible will skip adding it and no changes will be made. In this case, we’re adding a new entry to the /etc/hosts file. Then specify the line to be added at EOF. This has replaced the dest option which was used in Ansible 2.3 and earlier versions. Begin by specifying the path of the file where you are going to add the line using the path attribute.
#Ansible make install only if changes how to#
To start off, we will begin by learning how to create a line if it is not present in a file. Inserting a line at the end of the file (EOF) We are going to take a closer look at each of these. It can be used for inserting a new line, removing or modifying an existing line from the file. The Ansible inline module can be used in a variety of ways. Upon running the playbook, the name of the domain name changes accordingly as shown: # ansible-playbook change_hostname.yml We will create a playbook file change_hostname.yml which will look as follows: - hosts: 127.0.0.1 Our second objective is to change a hostname entry in my /etc/hosts file from to # ansible-playbook sample.txtįrom the output, you can clearly see that the string ‘ Unix’ has been replaced by ‘ Linux’ To achieve that, we are going to create a playbook file as shown. The goal is to replace the string ‘ Unix’ with ‘ Linux’. Thanks to Linux Torvalds’ efforts, Unix grew to become the most popular opensource system.
#Ansible make install only if changes free#
Unix is a free and opensource system used by developers, and desktop lovers. I have a sample text file called sample.txt which has the content below. Replace: 'word to replace the search string' Regexp: 'string or regular expression for search' This is how the syntax looks like with the replace module: - replace: The ‘ replace‘ directive – This is the replacement word or string.Additionally, you can pass any regular Python expression. The ‘ regexp‘ directive – The string to be replaced or changed.
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The location of the file denoted by the ‘ path‘ directive.