Problems with module blockinfile

So I just want to state that I’m new to Ansible and not sure how to debug issues yet, any guidance would be appreciated.

I’m attempting to use module blockinfile to update /etc/sysctl.conf file, but it doesn’t seem to want to cooperate.

playbook:
settings.yml
1 —
2 - hosts: dbservers
3 become: yes
4
5 tasks:
6 - name: insert/update sysctl.conf settings per specifications
7 blockinfile:
8 backup: yes
9 dest: /etc/sysctl.conf
10 marker: # {mark} ANSIBLE MANAGED BLOCK
11 content: |
12 kernel.shmmni = 4096
13 kernel.sem = 250 32000 100 128
14 fs.file-max = 512 * PROCESSES
15 net.ipv4.ip_local_port_range = 1024 6500
16 net.core.rmem_default = 4194304
17 net.core.rmem_max = 4194304
18 net.core.wmem_default = 262144
19 net.ipv4.tcp_wmem = 262144 262144 262144
20 net.ipv4.tcp_rmem = 4194304 4194304 4194304

execution:
$ ansible-playbook ./playbooks/settings.yml

results:
PLAY [dbservers] ***************************************************************

TASK [setup] *******************************************************************
ok: [ag-rhel6-temp.test.local]

TASK [insert/update sysctl.conf settings per specifications] ****************
fatal: [ag-rhel6-temp.test.local]: FAILED! => {“changed”: false, “failed”: true, “module_stderr”: “”, “module_stdout”: “Traceback (most recent call last):\r\n File "/tmp/ansible_3oLmj8/ansible_module_blockinfile.py", line 313, in \r\n main()\r\n File "/tmp/ansible_3oLmj8/ansible_module_blockinfile.py", line 243, in main\r\n marker0 = re.sub(r’{mark}', ‘BEGIN’, marker)\r\n File "/usr/lib64/python2.6/re.py", line 151, in sub\r\n return _compile(pattern, 0).sub(repl, string, count)\r\nTypeError: expected string or buffer\r\n”, “msg”: “MODULE FAILURE”, “parsed”: false}

NO MORE HOSTS LEFT *************************************************************
to retry, use: --limit @./playbooks/settings.retry

PLAY RECAP *********************************************************************
ag-rhel6-temp.test.local : ok=1 changed=0 unreachable=0 failed=1

Again, any help or pointers would be appreciated!
Thanks,
Rick

It's complaining about marker: not being a string, you need to put quotes around it.
Since the marker text you are using is the same as the default you can just delete the marker line.

Thank Kai, adding double quotes to the marker line resolved the issue!

-Rick