Ansible: Iterate through captured command output - perl

Question

I am trying to convert an existing Perl script to Ansible role. I facing trouble in iterating over a captured command output.
Here is the Perl Script:
# Description: This script will adjust the oom score of all the important system processes to a negative value so that OOM killer does not touch these processes ############
chomp(my $OS = `uname`);
if($OS eq "Linux")
{
my #file = `ps -ef|egrep 'sssd|wdmd|portreserve|autofs|automount|ypbind|rpcbind|rpc.statd|rpc.mountd|rpc.idampd|ntpd|lmgrd|Xvnc|vncconfig|irqblance|rpc.rquotad|metric|nscd|crond|snpslmd|getpwname.pl|mysqld|rsyslogd|xinetd|sendmail|lsf|tigervnc|tightvnc|cfadm' |egrep -ve 'ps|egrep' |awk '{print \$8,\$2}'`;
chomp(#file);
foreach my $element (#file)
{
chomp($element);
(my $process, my $pid) = (split(/\s/,$element))[0,1];
print "($process)($pid)\n";
system("echo -17 > /proc/$pid/oom_adj");
system("cat /proc/$pid/oom_adj");
}
}
else
{
print "The host is a $OS system, so no action taken\n";
}
Here is what I have tried so far in Ansible:
---
- name: Capture uname ouput
shell: "uname"
register: os_type
- name: Adjust OOM to negative so that OOM killer does not kill below processes
shell: 'ps -ef|egrep "sssd|wdmd|portreserve|autofs|automount|ypbind|rpcbind|rpc.statd|rpc.mountd|rpc.idampd|ntpd|lmgrd|Xvnc|vncconfig|irqblance|rpc.rquotad|metric|nscd|crond|snpslmd|getpwname.pl|mysqld|rsyslogd|xinetd|sendmail|lsf|tigervnc|tightvnc|cfadm" |egrep -ve "ps|egrep" |awk "{print \$8,\$2}"'
register: oom
when: os_type.stdout == 'Linux'
- debug: var=oom.stdout_lines
Now, I want to iterate over var and implement this part in Ansible:
foreach my $element (#file)
{
chomp($element);
(my $process, my $pid) = (split(/\s/,$element))[0,1];
print "($process)($pid)\n";
system("echo -17 > /proc/$pid/oom_adj");
system("cat /proc/$pid/oom_adj");
}
Please help.

Answer 1

below worked for me
- hosts: temp
gather_facts: yes
remote_user: root
tasks:
- name: Adjust OOM to negative so that OOM killer does not kill below processes
shell: 'ps -ef|egrep "sssd|wdmd|portreserve|autofs|automount|ypbind|rpcbind|rpc.statd|rpc.mountd|rpc.idampd|ntpd|lmgrd|Xvnc|vncconfig|irqblance|rpc.rquotad|metric|nscd|crond|snpslmd|getpwname.pl|mysqld|rsyslogd|xinetd|sendmail|lsf|tigervnc|tightvnc|cfadm" |egrep -ve "ps|egrep" |awk "{print \$2}"'
register: oom
when: ansible_system == 'Linux'
- debug: var=oom.stdout
- name: update the pid
raw: echo -17 > /proc/{{ item }}/oom_adj
loop: "{{ oom.stdout_lines }}"

Answer 2

I was able to figure this out. Below is the solution that worked for me. Thanks to everyone who tried to help me out. Appreciate it :)
---
- name: Capture uname ouput
shell: "uname"
register: os_type
- name: Gather important processes
shell: 'ps -ef|egrep "sssd|wdmd|portreserve|autofs|automount|ypbind|rpcbind|rpc.statd|rpc.mountd|rpc.idampd|ntpd|lmgrd|Xvnc|vncconfig|irqblance|rpc.rquotad|metric|nscd|crond|snpslmd|getpwname.pl|mysqld|rsyslogd|xinetd|sendmail|lsf|tigervnc|tightvnc|cfadm" |egrep -ve "ps|egrep" |awk "{print \$8,\$2}"'
register: oom
when: os_type.stdout == 'Linux'
- name: Adjust OOM to negative so that OOM killer does not kill important processes
shell: "echo -17 >> /proc/{{ item.split()[1] }}/oom_adj"
loop: "{{ oom.stdout_lines }}"
register: echo
- set_fact:
stdout_lines: []
- set_fact:
stdout_lines: "{{ stdout_lines + item.stdout_lines }}"
with_items: "{{ echo.results }}"
- debug:
msg: "This is a stdout line: {{ item }}"
with_items: "{{ stdout_lines }}"