Do not misunderstand the concept error handling in this document with error handling in usual software programming terminology.<\/p>\n
Usually when one writes a program, a syntax check will check for syntax including\u00a0indentation, spacing, etc. But it will not check if content such as package name to be installed using the playbook, parameters of a function in modules mentioned in the task , etc are correct. In this case the syntax check may be successful, but when running the playbook the execution may fail at<\/strong> the line incorrect parameters are mentioned and thus halt further execution<\/em> of the playbook.<\/p>\n The below example is of a playbook that tries installation of two dnf packages. However due to the typo related\u00a0httpd the remaining execution of the playbook to install mariadb server too stops.<\/p>\n [root@centos9vm ~]#<\/strong> cat errorHandler.yml<\/p>\n ===== ==== – name: Install mariadb ==== ===<\/p>\n [root@centos9vm ~]#<\/strong> ansible-navigator run -m stdout errorHandler.yml –syntax-check<\/p>\n ===== === ===== ===<\/p>\n [root@centos9vm ~]#<\/strong> ansible-navigator run -m stdout errorHandler.yml<\/p>\n ===== ====<\/p>\n PLAY [Task Failure Exercise] ***************************************************<\/em><\/p>\n TASK [Gathering Facts] *********************************************************<\/em> TASK [Install httpd] ***********************************************************<\/em> PLAY RECAP *********************************************************************<\/em> ===== ===<\/p>\n Now let us add the error handling parameter and check the result.<\/p>\n [root@centos9vm ~]#<\/strong> cat errorHandler.yml<\/p>\n ==== ==== – name: Install mariadb<\/em> ==== ===<\/p>\n [root@centos9vm ~]#<\/strong> ansible-navigator run -m stdout errorHandler.yml<\/p>\n ===== ===<\/p>\n PLAY [Task Failure Exercise] ***************************************************<\/em><\/p>\n TASK [Gathering Facts] *********************************************************<\/em> TASK [Install httpd] ***********************************************************<\/em> TASK [Install mariadb] *********************************************************<\/em> PLAY RECAP *********************************************************************<\/em>
\n– – –<\/em>
\n– name: Task Failure Exercise
\n hosts: 192.168.48.129
\n vars:
\n web_package: http
\n db_pacakge: mariadb-server
\n myPackage:
\n – http
\n – mariadb-server
\n db_service: mariadb
\n tasks:
\n – name: Install httpd
\n ansible.builtin.dnf:
\n name: “{{ web_package }}”
\n state: present<\/p>\n
\n ansible.builtin.dnf:
\n name: “{{ db_pacakge }}”
\n state: present<\/p>\n
\nplaybook: \/root\/errorHandler.yml<\/em><\/p>\n
\nok: [192.168.48.129]<\/em><\/p>\n
\nfatal: [192.168.48.129]: FAILED! => {“changed”: false, “failures”: [“No package http available.”], “msg”: “Failed to install some of the specified packages”, “rc”: 1, “results”: []}<\/em><\/p>\n
\n192.168.48.129 : ok=1 changed=0 unreachable=0 failed=1 skipped=0 rescued=0 ignored=0<\/em>
\nPlease review the log for errors.<\/em><\/p>\n
\n– – –<\/em>
\n– name: Task Failure Exercise<\/em>
\n hosts: 192.168.48.129<\/em>
\n vars:<\/em>
\n web_package: http<\/em>
\n db_pacakge: mariadb-server<\/em>
\n myPackage:<\/em>
\n – http<\/em>
\n – mariadb-server<\/em>
\n db_service: mariadb<\/em>
\n tasks:<\/em>
\n – name: Install httpd<\/em>
\n ansible.builtin.dnf:<\/em>
\n name: “{{ web_package }}”<\/em>
\n state: present<\/em>
\n ignore_errors: yes<\/span><\/em><\/p>\n
\n ansible.builtin.dnf:<\/em>
\n name: “{{ db_pacakge }}”<\/em>
\n state: present<\/em><\/p>\n
\nok: [192.168.48.129]<\/em><\/p>\n
\nfatal: [192.168.48.129]: FAILED! => {“changed”: false, “failures”: [“No package http available.”], “msg”: “Failed to install some of the specified packages”, “rc”: 1, “results”: []}<\/em>
\n…ignoring<\/em><\/span><\/p>\n
\nchanged: [192.168.48.129]<\/em><\/p>\n
\n192.168.48.129 : ok=3 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=1<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"