{"id":1340,"date":"2024-05-26T15:53:10","date_gmt":"2024-05-26T15:53:10","guid":{"rendered":"http:\/\/shijuvarghese.com\/?p=1340"},"modified":"2024-06-11T23:51:26","modified_gmt":"2024-06-11T23:51:26","slug":"ansible-adding-a-line-to-a-file","status":"publish","type":"post","link":"http:\/\/shijuvarghese.com\/?p=1340","title":{"rendered":"Ansible: Adding a line to a file. At the end of file, and replacement of line"},"content":{"rendered":"

Ansible allows admins to add lines to files.\u00a0The below playbook adds a sudoers configuration file, and adds an entry to allow users of group “webadmin” sudo to all users and execute all commands as root.<\/p>\n

It creates a file “\/etc\/sudoers.d\/webadmin” and adds an entry to it. The validate<\/em> parameter specifies the command to run to verify that the file is correct.<\/p>\n

[root@centos9vm ~]#<\/strong> cat addaline.yml<\/p>\n

====
\n–\u00a0 – –<\/em>
\n– name: Add a line in sudoers file<\/em>
\n     hosts: testGRP<\/em>
\n     tasks:<\/em>
\n         – name: create a sudoers config file and add a line<\/em>
\n             ansible.builtin.lineinfile:<\/em>
\n                 path: \/etc\/sudoers.d\/webadmin<\/em>
\n                 state: present<\/em>
\n                 create: yes<\/em>
\n                 mode: 0440<\/em>
\n                 line: “%webadmin ALL=(ALL) NOPASSWD :ALL \\n#Helo\\n####\\n###aaa”<\/em>
\n                 validate: \/usr\/sbin\/visudo -cf %s<\/em><\/p>\n

====<\/p>\n

[root@centos9vm ~]# ansible-navigator run -m stdout addaline.yml<\/p>\n

=====<\/p>\n

PLAY [Add a line in sudoers file] **********************************************<\/em><\/p>\n

TASK [Gathering Facts] *********************************************************<\/em>
\nok: [192.168.48.129]<\/em>
\nok: [192.168.48.132]<\/em><\/p>\n

TASK [create a sudoers config file and add a line] *****************************<\/em>
\nok: [192.168.48.129]<\/em>
\nok: [192.168.48.132]<\/em><\/p>\n

PLAY RECAP *********************************************************************<\/em>
\n192.168.48.129 : ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0<\/em>
\n192.168.48.132 : ok=2 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0<\/em><\/p>\n

======<\/p>\n

Now let us check from the node\u00a0centos9test1<\/p>\n

[user1@centos9test1 ~]$<\/strong> echo “Hello” > stemp.txt<\/p>\n

[user1@centos9test1 ~]$<\/strong>\u00a0echo “Hawdi” >> stemp.txt
\n[user1@centos9test1 ~]$<\/strong> sudo<\/span> cp stemp.txt \/root\/
\n[user1@centos9test1 ~]$<\/strong> cat \/root\/stemp.txt
\ncat: \/root\/stemp.txt: Permission denied
\n[user1@centos9test1 ~]$<\/strong> sudo<\/span> cat \/root\/stemp.txt<\/p>\n

===== ====<\/strong>
\nHello<\/em>
\n Hawdi<\/em>
\n===== ====<\/strong><\/p>\n

Now let us write a playbook to use the above stemp.txt file that was created and replace the line “Hello” with “goooogle”<\/p>\n

[root@centos9vm ~]#<\/strong> cat replace.yml<\/p>\n

==== ==
\n– – –<\/em>
\n– name: Play book to replace a line in a file<\/em>
\n     hosts: 192.168.48.132<\/em>
\n     tasks:<\/em>
\n         – name: Task to replace the line<\/em>
\n             ansible.builtin.lineinfile:<\/em>
\n                 path: \/root\/stemp.txt<\/em>
\n                 regexp: ‘^Hello’<\/em>
\n                 line: Goooogle<\/em><\/p>\n

==== ==<\/p>\n

Now let us run the playbook<\/p>\n

[root@centos9vm ~]#<\/strong> ansible-navigator run -m stdout replace.yml<\/p>\n

==== ====<\/p>\n

PLAY [Play book to replace a line in a file] ***********************************<\/em><\/p>\n

TASK [Gathering Facts] *********************************************************<\/em>
\nok: [192.168.48.132]<\/em><\/p>\n

TASK [Task to replace the line] ************************************************<\/em>
\nchanged: [192.168.48.132]<\/em><\/p>\n

PLAY RECAP *********************************************************************<\/em>
\n192.168.48.132 : ok=2 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0<\/em><\/p>\n

==== ===<\/p>\n

Verify the outcome by reading the file in\u00a0192.168.48.132<\/p>\n

[user1@centos9test1 ~]$<\/strong> sudo cat \/root\/stemp.txt<\/p>\n

===== ==
\nGoooogle<\/em>
\nHawdi<\/em><\/p>\n

===== ==<\/p>\n","protected":false},"excerpt":{"rendered":"

Ansible allows admins to add lines to files.\u00a0The below playbook adds a sudoers configuration file, and adds an entry to allow users of group “webadmin” […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32,21,3],"tags":[],"class_list":["post-1340","post","type-post","status-publish","format-standard","hentry","category-ansible","category-devops","category-linux"],"_links":{"self":[{"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=\/wp\/v2\/posts\/1340","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1340"}],"version-history":[{"count":18,"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=\/wp\/v2\/posts\/1340\/revisions"}],"predecessor-version":[{"id":1359,"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=\/wp\/v2\/posts\/1340\/revisions\/1359"}],"wp:attachment":[{"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1340"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/shijuvarghese.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1340"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}