In this post we are going to see how we can use the below two modules to download a file from a URL or and FTP server to the managed nodes, and replace certain content of that file.<\/p>\n
In the below example we use three nodes:<\/p>\n
Note: Both the managed nodes have \/dev\/sda device, but do not have \/dev\/vdb<\/p>\n
Let us check the disk size in these nodes:<\/p>\n
[root@centos9test1 ~]#<\/strong> fdisk -l | grep \/dev\/sda [root@centosMYOBvm<\/span> ~]#<\/strong> fdisk -l | grep \/dev\/sda The below playbook downloads a sample template to\u00a0make a note of the sizes of the sda and vdb disks, and after that it populated the file with actual disk size. In case \/dev\/vdb is present, it records the actual value, but makes it as NONE if the disk is not present<\/p>\n [root@centos9vm ~]#<\/strong> wget http:\/\/192.168.48.132\/hardwareInfo.empty<\/p>\n –2024-07-06 00:43:50– http:\/\/192.168.48.132\/hardwareInfo.empty<\/em> hardwareInfo.empty 100%[===================>] 42 –.-KB\/s in 0s<\/em><\/p>\n 2024-07-06 00:43:50 (4.60 MB\/s) – \u2018hardwareInfo.empty\u2019 saved [42\/42]<\/em><\/p>\n === ===\u00a0<\/em><\/p>\n [root@centos9vm ~]#<\/strong> cat hardwareInfo.empty<\/p>\n my_vda=disk_sda_size<\/em> ===== ==<\/p>\n Let us look at the playbook created<\/p>\n <\/p>\n [root@centos9vm ~]#<\/strong> cat hardware.yml<\/p>\n ====== == \u00a0\u00a0\u00a0\u00a0– name: Task to replace the \/dev\/sda_size<\/em> \u00a0\u00a0\u00a0\u00a0– name: Task to print the output of sda size<\/em> \u00a0 \u00a0 – name: Task to replace the \/dev\/vdb_size<\/em> \u00a0 \u00a0 – name: Task to print the output of vdb size<\/em> \u00a0\u00a0\u00a0\u00a0– name: Task to replace \/dev\/vdb_size value with NONE<\/em> ====== ===<\/p>\n [root@centos9vm ~]#<\/strong> ansible-navigator run -m stdout hardware.yml<\/p>\n ==== ===<\/p>\n PLAY [Playbook to capture hardware info] **********************************************************************************************<\/em><\/p>\n TASK [Gathering Facts] ****************************************************************************************************************<\/em> TASK [Task to download the file from URL] *********************************************************************************************<\/em> TASK [Task to replace the \/dev\/sda_size] **********************************************************************************************<\/em> TASK [Task to print the output of sda size] *******************************************************************************************<\/em> TASK [Task to replace the \/dev\/vdb_size] **********************************************************************************************<\/em> …….. TASK [Task to print the output of vdb size] *******************************************************************************************<\/em> TASK [Task to replace \/dev\/vdb_size value with NONE] **********************************************************************************<\/em> PLAY RECAP ****************************************************************************************************************************<\/em> ===== ====<\/p>\n Now let us check the updated file in the managed nodes<\/p>\n [root@centos9vm ~]#<\/strong> ssh 192.168.48.129 ‘cat \/root\/hardwareInfo.txt’ [root@centos9vm ~]#<\/strong> ssh 192.168.48.132 ‘cat \/root\/hardwareInfo.txt’ <\/p>\n","protected":false},"excerpt":{"rendered":"
\nDisk \/dev\/sda: 1 GiB, 1073741824 bytes, 2097152 sectors<\/p>\n
\nDisk \/dev\/sda: 6 GiB, 6442450944 bytes, 12582912 sectors<\/p>\n
\nConnecting to 192.168.48.132:80… connected.<\/em>
\nHTTP request sent, awaiting response… 200 OK<\/em>
\nLength: 42<\/em>
\nSaving to: \u2018hardwareInfo.empty\u2019<\/em><\/p>\n
\nmy_vdb=disk_vdb_size<\/em><\/p>\n
\n– – –<\/em>
\n– name: Playbook to capture hardware info<\/em>
\n\u00a0 hosts: dev<\/em>
\n \u00a0\u00a0become: true<\/em>
\n \u00a0\u00a0ignore_errors: yes<\/span><\/em>
\n \u00a0\u00a0tasks:<\/em>
\n\u00a0\u00a0\u00a0\u00a0– name: Task to download the file from URL<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ansible.builtin.get_url:<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0url: http:\/\/192.168.48.132\/hardwareInfo.empty<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0dest: \/root\/hardwareInfo.txt<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mode: 0755<\/em><\/p>\n
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ansible.builtin.replace:<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0path: \/root\/hardwareInfo.txt<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0regexp: “disk_sda_size”<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replace: “{{ ansible_facts.devices.sda.size }}”<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0register:<\/span> theOutput1<\/em><\/p>\n
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ansible.builtin.debug:<\/em>
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0var: theOutput1<\/em><\/p>\n
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ansible.builtin.replace:<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0path: \/root\/hardwareInfo.txt<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0regexp: “disk_vdb_size”<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replace: “{{ ansible_facts.devices.vdb.size }}”<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0register: theOutput2<\/em><\/p>\n
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ansible.builtin.debug:<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0var: theOutput2<\/em><\/p>\n
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ansible.builtin.replace:<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0path: \/root\/hardwareInfo.txt<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0regexp: “disk_vdb_size”<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0replace: NONE<\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0when:<\/span><\/em>
\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0theOutput2.failed == true<\/em><\/p>\n
\nok: [192.168.48.129]<\/em>
\nok: [192.168.48.132]<\/em><\/p>\n
\nok: [192.168.48.132]<\/em>
\nok: [192.168.48.129]<\/em><\/p>\n
\nok: [192.168.48.129]<\/em>
\nok: [192.168.48.132]<\/em><\/p>\n
\nok: [192.168.48.132] => {<\/em>
\n “theOutput1”: {<\/em>
\n “changed”: false,<\/em>
\n “failed”: false,<\/em>
\n “msg”: “”,<\/em>
\n “rc”: 0<\/em>
\n }<\/em>
\n}<\/em>
\nok: [192.168.48.129] => {<\/em>
\n “theOutput1”: {<\/em>
\n “changed”: false,<\/em>
\n “failed”: false,<\/em>
\n “msg”: “”,<\/em>
\n “rc”: 0<\/em>
\n }<\/em>
\n}<\/em><\/p>\n
\nfatal: [192.168.48.132]: FAILED! => {“msg”: “The task includes an option with an undefined variable.\u00a0<\/em><\/p>\n
\nfatal: [192.168.48.129]: FAILED! => {“msg”: “The task includes an option with an undefined variable.\u00a0<\/em>
\n…ignoring<\/em><\/p>\n
\nok: [192.168.48.132] => {<\/em>
\n “theOutput2”: {<\/em>
\n “failed”: true,<\/em>
\n…..<\/em><\/p>\n
\nok: [192.168.48.129]<\/em>
\nok: [192.168.48.132]<\/em><\/p>\n
\n192.168.48.129 : ok=7 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=1<\/em>
\n192.168.48.132 : ok=7 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=1<\/em><\/p>\n
\nmy_vda=6.00 GB
\nmy_vdb=NONE<\/p>\n
\nmy_vda=1.00 GB
\nmy_vdb=NONE<\/p>\n