I would like to execute a command to obtain the current AWS EC2 launch template version in an integer format so I can do basic arithmetic on it to use in subsequent queries / deletes.
For example:
tasks:
- name: Lookup current default version of EC2 launch template
command: aws ec2 describe-launch-template-versions --launch-template-id lt-xxx --filters Name=is-default-version,Value=true --query 'LaunchTemplateVersions[*].[VersionNumber]'
delegate_to: localhost
register: result
- name: Show results
debug:
msg: '{{ result.stdout }}'
delegate_to: localhost
If this output is '5' I would like to subtract 1 from it so I can execute an additional command to do the following:
aws ec2 delete-launch-template-versions --launch-template-id lt-xxx --versions {{result - 1}}
I realize this will not work as written, but this is the premise I'm going for.
Convert the string to an integer. For example
- command: echo 5
register: result
- command: "echo {{ result.stdout|int - 1 }}"
register: result
- debug:
var: result.stdout
gives
result.stdout: '4'
The type of the command return values' attribute stdout is string. See the results below
- command: echo 5
register: result
- debug:
msg: |-
result.stdout: {{ result.stdout }}
result.stdout|type_debug: {{ result.stdout|type_debug }}
result.stdout|int|type_debug: {{ result.stdout|int|type_debug }}
msg: |-
result.stdout: 5
result.stdout|type_debug: AnsibleUnsafeText
result.stdout|int|type_debug: int
Related
On an Ansible playbook, I'm trying to execute a shell command only if a service exist on the remote server.
I have 3 tasks :
service_facts
execution of shell command if tomcat is installed
display the output of the shell command if tomcat is installed
Here is my code :
- name: Get Infos
hosts: all
gather_facts: yes
become: false
remote_user: [MY_USER]
tasks:
- name: Get the list of services
service_facts:
- name: Get version of Tomcat if installed
become: true
shell: 'java -cp /opt/tomcat/lib/catalina.jar org.apache.catalina.util.ServerInfo | grep "Server version"'
register: tomcat_version
when: "'tomcat.service' in services"
- debug: msg="{{ tomcat_version.stdout_lines }}"
when: "'tomcat.service' in services"
The problem is on certains servers the service name is, for example, tomcat-8.1
How can i use regex in the when condition?
I tried regex(), regex_search(), either I'm doing it wrong or I don't know how to do it.
Have you any idea how to do it?
Thanks in advance!
Count matching items. For example
- service_facts:
- block:
- shell: smartctl --version | head -1
register: smart_version
- debug:
msg: "{{ smart_version.stdout_lines }}"
when: _srvcs|length > 0
vars:
_regex: '.*smart.*'
_srvcs: "{{ services|select('match', _regex) }}"
gives
msg:
- smartctl 7.1 2019-12-30 r5022 [x86_64-linux-5.4.0-73-generic] (local build)
The next option is to intersect the list of services, e.g.
when: _srvcs|length > 0
vars:
my_services:
- smartmontools.service
- smart-8.1
- smart-devel.0.0.1
_srvcs: "{{ my_services|intersect(services) }}"
Debug
Q: "It gives me a failure on the server where my service doesn't exist, cause the playbook still tries to execute the shell. Is it normal?"
A: No. It is not normal. Print debug and find out why the condition evaluates to true, i.e. what service(s) match either the regex or the list. For example
- debug:
msg: |
_srvcs:
{{ _srvcs|to_nice_yaml|indent(2) }}
when: debug|d(false)|bool
vars:
my_services:
- smartmontools.service
- smart-8.1
- smart-devel.0.0.1
_srvcs: "{{ my_services|intersect(services) }}"
gives
msg: |-
_srvcs:
- smartmontools.service
To enable the task run the playbook with the option -e debug=true.
I need some help with extracting a specific line from a file and then extracting a column, assign it to a variable and then use that variable in the next task.
I have the file with this format on the confluent broker server
Save the key. It cannot be retrieved later.
+------------+----------------------------------------------+
| Enc Key | omykeyvaluecontinuousstringgoeshereandmakelong= |
+------------+----------------------------------------------+
I am trying to write Ansible task that will read the third line and then extract the key into a variable which I need to export as an environment variable in the task. In the next task I will be executing a confluent command as a shell command.
I tried something like below, but it doesn't work - I get error
vars:
ansible_ssh_extra_args: "-o StrictHostKeyChecking=no"
ansible_host_key_checking: false
contents: "{{ lookup('file', '/etc/kafka/info.txt') }}"
contents2: "{{ lookup('file', '/etc/kafka/info.txt').splitlines() }}"
- name: set fact
set_fact:
extract_key: "{{ contents.split('\n')[2] }}"
- name: Display output
debug: msg="{{ extract_key }}"
And then extract the key value from extract_key variable
How can I achieve this?
Thank you
The task below does the job
- set_fact:
extract_key: "{{ contents.split('\n').2.split('|').2|trim }}"
gives
extract_key: omykeyvaluecontinuousstringgoeshereandmakelong=
You can use this filter if only text lines are fixed:
- name: capturing Key
shell: echo {{ contents }} | head -3 | tail -1 | sed 's/|/\n/g' | sed -n 3p
register: extract_key
- name: Display output
debug: msg="{{ extract_key.stdout }}"
This returns omykeyvaluecontinuousstringgoeshereandmakelong=
I am trying parse month,day and year from show clock output using regex_search, getting error.
from cli of a router i see this -
sh clock
16:22:12.975 PST Wed Jan 27 2021
- name: Run sh log
cisco.ios.ios_command:
commands:
- sh clock
register: output1
- name: sh clock output
debug:
msg: "{{ output1.stdout_lines | regex_search('(Jan(uary)?|Feb(ruary)?|Mar(ch)?|Apr(il)?|May|Jun(e)?|Jul(y)?|Aug(ust)?|Sep(tember)?|Oct(ober)?|Nov(ember)?|Dec(ember)?)^\s+\d{1,2}\s+\d{4}' }}"
error
The offending line appears to be:
debug:
msg: "{{ output1.stdout_lines | regex_search('(Jan(uary)?|Feb(ruary)?|Mar(ch)?|Apr(il)?|May|Jun(e)?|Jul(y)?|Aug(ust)?|Sep(tember)?|Oct(ober)?|Nov(ember)?|Dec(ember)?)\s+\d{1,2}\s+\d{4}' }}"
^ here
We could be wrong, but this one looks like it might be an issue with
missing quotes. Always quote template expression brackets when they
start a value. For instance:
with_items:
- {{ foo }}
Should be written as:
with_items:
- "{{ foo }}"
desired/wanted debug msg is below ,i don't want time, just need month day and year
Jan 27 2021
Use regex_replace. Put the regex into a separate single-quoted variable. For example, the task below does the job
- name: sh clock output
debug:
msg: "{{ output1.stdout_lines|regex_replace(my_regex, my_replace) }}"
vars:
my_regex: '^(.*)(Jan(uary)?|Feb(ruary)?|Mar(ch)?|Apr(il)?|May|Jun(e)?|Jul(y)?|Aug(ust)?|Sep(tember)?|Oct(ober)?|Nov(ember)?|Dec(ember)?)\s+(\d{1,2})\s+(\d{4})$'
my_replace: '\2 \14 \15'
The splitting is simpler. For example, the task below gives the same result
- debug:
msg: "{{ arr[-3] }} {{ arr[-2] }} {{ arr[-1] }}"
vars:
arr: "{{ output1.stdout_lines.split() }}"
See Handling dates and times
I am trying to match the "OK" from the following output with regex and store it in a varible:
System 'server.mylabserver.com'
status OK
monitoring status Monitored
monitoring mode active
on reboot start
load average [0.00] [0.01] [0.05]
cpu 0.1%us 0.1%sy 0.0%wa
memory usage 367.9 MB [20.0%]
swap usage 0 B [0.0%]
uptime 2h 10m
boot time Mon, 02 Apr 2018 06:51:01
data collected Mon, 02 Apr 2018 09:01:02
Ansible code with "regex_replace" that I've tried:
- name: Fetch the monit status
shell: "monit status | tail -n +3"
register: monit_status_raw
tags: basic_monitoring
- name: Extract monit variables
set_fact:
vmstatus: "{{ monit_status_raw | regex_replace('^\s\s([a-z]*)\s+', '\\1:')}}"
Error:
The offending line appears to be:
set_fact:
vmstatus: "{{ monit_status_raw | regex_replace('^\s\s([a-z]*)\s+', '\\1')}}"
^ here
We could be wrong, but this one looks like it might be an issue with
missing quotes. Always quote template expression brackets when they
start a value. For instance:
with_items:
- {{ foo }}
Should be written as:
with_items:
- "{{ foo }}"
Ansible code with "regex_search" that I've tried:
- name: Fetch the monit status
shell: "monit status | tail -n +3"
register: monit_status_raw
- name: Extract monit variables
set_fact:
vmstatus: "{{ monit_status_raw | regex_search('^\s\sstatus\s+(.*)$') }}"
Error:
The offending line appears to be:
set_fact:
vmstatus: "{{ monit_status_raw | regex_search('^\s\sstatus\s+(.*)$') }}"
^ here
We could be wrong, but this one looks like it might be an issue with
missing quotes. Always quote template expression brackets when they
start a value. For instance:
with_items:
- {{ foo }}
Should be written as:
with_items:
- "{{ foo }}"
Any idea what it's wrong in the regexes?
Thank you,
Dan
I think if you'd like to use regexp_search - you need to give a string and think about escaping characters, and then you need to use some construction as:
with_items
- "{{ monit_status_raw.stdout_lines }}"
But I think it will be simpler:
- name: Fetch the monit status
shell: 'monit status | tail -n +2 | grep "^\s*status" '
register: monit_status_raw
- set_fact:
vmstatus: "{{ monit_status_raw.stdout.split('status')[1]| replace(' ','')}}"
You will get vmstatus = 'Ok', if you use your sample.
My problem is with ansible and parsing stdout. I need to capture the stdout from an ansible play and parse this output for a specific substring within stdout and save into a var. My specific use case is below
- shell: "vault.sh --keystore EAP_HOME/vault/vault.keystore |
--keystore-password vault22 --alias vault --vault-block |
vb --attribute password --sec-attr 0penS3sam3 --enc-dir |
EAP_HOME/vault/ --iteration 120 --salt 1234abcd"
register: results
become: true
This generates an output with the following line, the goal is to capture the masked key that jboss vault generates and save that in an ansible var so I can use it to configure the standalone.xml template:
vault-option name="KEYSTORE_PASSWORD" value="MASK-5dOaAVafCSd"/>
I need a way parse this string with possibly regex and save the "MASK-5dOaAVafCSd" substring into an ansible var using set_facts module or any other ansible module.
Currently my code looks like this
#example stdout
results: vault-option name=\"KEYSTORE_PASSWORD\" value=\"MASK-5dOaAVafCSd\"/>
- name: JBOSS_VAULT:define keystore password masked value variable
set_fact:
masked_value: |
"{{ results.stdout |
regex_replace('^.+(MASK-.+?)\\.+','\\\1') }}"
This code is defining masked_value as the results.stdout, not the expected capture group.
You are very close. I advice you to use regex101.com to test regular expressions.
Here is my solution:
---
- hosts: localhost
gather_facts: no
tasks:
- shell: echo 'vault-option name="KEYSTORE_PASSWORD" value="MASK-5dOaAVafCSd"'
register: results
- set_fact:
myvalue: "{{ results.stdout | regex_search(regexp,'\\1') }}"
vars:
regexp: 'value=\"([^"]+)'
- debug:
var: myvalue
result:
ok: [localhost] => {
"myvalue": [
"MASK-5dOaAVafCSd"
]
}
Update:
regex_search returns a list of found matches, so to get only first one use:
{{ results.stdout | regex_search(regexp,'\\1') | first }}
The above solution worked for me, however I had to do some extra logic to filter shell command output to get to the line which contains following
<vault-option name="KEYSTORE_PASSWORD" value="MASK-6qcNdkIprlA"/>
because vault command output has many lines in it. Once this line is captured, the solution given by Konstantin works just fine. Below is the whole thing that needs to done in one place.
- name: Creating jboss vault
shell: |
{{ baseDir }}/bin/vault.sh -e {{ vaultDir }} -k {{ keystoreURL }} -p {{ keystorePassword }} \
-s {{ keystoreSalt }} -i {{ iterationCount }} -v {{ keystoreAlias }} -b {{ vaultBlock }} \
-a {{ attributeName }} -x {{ attributeValue }}
register: vaultResult
- set_fact:
jbossKeystorePassword: "{{ item | regex_search('value=\"([^\"]+)','\\1') | first }}"
when: item | trim | match('.*KEYSTORE_PASSWORD.*')
with_items:
- "{{ vaultResult.stdout_lines }}"
- debug:
var: jbossKeystorePassword
Be sure to replace all variables with your values in above vault.sh command.