The short answer is no. If you want to modify the string with backrefs,
then lineinfile will not create the line if it doesn't exist.
But step back and consider your options for managing your override.conf
file.
A. The best scenario is to take total ownership of the entire file,
generating it from variables in your project. You have to take changes
into account as you upgrade kafka etc, but you should do that in any case.
B. If for some reasons you aren't ready or able to take ownership of the
whole file, then the next best thing is to at least take complete
ownership of the 'Environment="KAFKA…' line, and build it from
information in your project. You can still have appropriate differences
on various instances, but that would all by controlled by data and logic
in your Ansible project. See the example below.
C. The absolute worst scenario, the situation where you should be
saying, "How can we move to option 'B' or 'A' as soon as possible?", is
when you try to tweak a line that may or may not exist, in a file that
may or may not exist, and that may have unknown variances between hosts
for reasons that (apparently) aren't coming from your configuration
management system. As a stop-gap step in a house-on-fire situation,
you've got to do what you've got to do. But you should stop doing it as
soon as possible.
That's not to say that 'C' doesn't work; it does, and I've managed files
that way for years. But I got in that situation for two reasons: 1)
Nobody told me what I just told you, and 2) I figured my problem was to
tweak a line in a file, and if there was an Ansible module to do just
that, then it must be an okay way to do it.
Here's a short playbook with variables to inform the line in question.
Clearly you could use group_vars, host_vars, and/or inventory variables
to tailor the result for individual hosts. But I strongly encourage you
to pull the responsibility for that entire line (option 'B') or better
yet that entire file (option 'A') into your Ansible project.
---
# sameer-0.yml
- name: KAFKA_JMX options management
hosts: localhost
gather_facts: false
vars:
filename: sameer-0-override.conf
kafka_jmx_opts:
-
'-javaagent:/usr/share/java/kafka/jolokia.jar=port=8778,host=pilot01.test'
- '-Dcom.sun.management.jmxremote'
- '-Dcom.sun.management.jmxremote.authenticate=false'
- '-Dcom.sun.management.jmxremote.ssl=false'
- '-Djava.rmi.server.hostname=pilot01.test'
- '-Dcom.sun.management.jmxremote.rmi.port=1099'
kafka_jmx_opts_str: 'KAFKA_JMX_OPTS={{ kafka_jmx_opts | join(" ") }}'
tasks:
- name: Manage kafka_jms_opts in override.conf
ansible.builtin.lineinfile:
path: '{{ filename }}'
regexp: 'Environment="KAFKA_JMX_OPTS=.*"'
line: 'Environment="{{ kafka_jmx_opts_str }}"'
state: present
create: true # You should have "owner:", "group:", and "mode:" here too.
On 11/1/23 7:12 AM, Sameer Modak wrote:
Hello Team,
I could figure out after 10 tries this is how i got it
- name: append the line
lineinfile:
path: /tmp/hello.txt
backrefs: yes
regexp: '^(.*KAFKA_JMX_OPTS.*)$"'. <------------------------
line: '\1
-javaagent:{{jmxexporter_jar_path}}={{zookeeper_jmxexporter_port}}:{{zookeeper_jmxexporter_config_path}}"''
but like can we handle the if else in one line in file
this will not work when file does not have "KAFKA_JMX_OPTS" in it. Can
we do it in same taks using item 2 regexp
if sting absent add entire line else if string present append it.
On Wednesday, November 1, 2023 at 4:11:40 PM UTC+5:30 Sameer Modak wrote:
We want to only append string
-javaagent:{{jmxexporter_jar_path}}={{zookeeper_jmxexporter_port}}:{{zookeeper_jmxexporter_config_path}}"'
to a file override.conf
if we have "Environment="KAFKA_JMX_OPTS" in it else
add new line "actual line"
Environment="KAFKA_OPTS=-javaagent:{{jmxexporter_jar_path}}={{zookeeper_jmxexporter_port}}:{{zookeeper_jmxexporter_config_path}}"'
So basically append if something is there else add new line.
I m struggling to get regex ryt.
Currently the override.conf file has this below content with jmx
parameters in it so we want append above line/string to end of
the existing line
Environment="KAFKA_JMX_OPTS=-javaagent:/usr/share/java/kafka/jolokia.jar=port=8778,host=pilot01.test
-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.authenticate=false
-Dcom.sun.management.jmxremote.ssl=false
-Djava.rmi.server.hostname=pilot01.test
-Dcom.sun.management.jmxremote.rmi.port=1099"
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