I have been trying to run the command
brew services restart nrpe
with the help of Ansible's homebrew module.
I have gone through the documentation (homebrew ansible doc) but I couldn't find an example which does a similar thing. I have tried the following:
- homebrew:
name: nrpe
state: present
install_options: services,restart
but it didn't work. Please let me know the correct way to run the command
brew services restart nrpe.
P.S. - Installation of nrpe or other services though homebrew is working great.
Edit 1 - Also including the Nagios tag because this might also be faced by the nagios community.
According to the documentation of the homebrew ansible module, the command :
brew services restart nrpe
seems not implemented. The solution could be to use the command module:
- name: restart the nrpe service
command: brew services restart nrpe
Related
I wanted to do an uninstallation of OMS agent in our Linux machines. Unfortunately, we do have different OMS agent versions assigned to each machine. I hard coded the version from my Ansible script
command: sudo {{ file_path }}/omsagent-1.13.9-0.universal.x64.sh —-purge
It only works for machine with that same OMS agent version else, it will fail.
I tried adding wildcard syntax, but it is getting an error stating that command not found
stderr: “sudo :/home/filename/omsagent-* : command not found
if I changed my previous command to
command: sudo {{file_path}}/omsagent-*.universal.x64.sh —-purge
Since I do not have this specific agent in place, I can't provide a full tested working example, but some some guidance.
According the package documentation and All bundle operations, the bundle has an option for
--version-check Check versions already installed to see if upgradable.
which should provide the installed version. Furthermore any installed agent has an directory with service control script
/opt/microsoft/omsagent/bin/service_control ...
and probably others, like scxadmin --version. By executing one or the other it should be possible to gather the correct installed version of the agent.
- name: Gather installed OMS agent version
become: true
become_method: sudo
shell:
cmd: /opt/microsoft/omsagent/bin/service_control status | grep <whatever is necessary to get the version string only>
register: VERSION
changed_when: false
check_mode: false
Please take note that instead of using sudo within the command, you should use become. Since it is a version reporting task only, you should also use changed_when and check_mode.
After the correct version is gathered you use it like
- name: Purge installed OMS agent version
become: true
become_method: sudo
shell:
cmd: "omsagent-{{ VERSION }}.universal.x64.sh —-purge"
Is there any reason why the option --upgrade or --force can`t be used?
You may also have a look into How to troubleshoot issues with the Log Analytics agent for Linux, there is a standalone versionless purge script available.
In an ansible (ver. 2.10) playbook I would need to invoke the dpkg-reconfigure openssh-server command to recreate SSH server keys.
- name: Create new SSH host's keys
shell: dpkg-reconfigure openssh-server
notify: restart sshd
The problem is that dpkg-reconfigure openssh-server opens a dialog box, and the script get stucked...
Looking into ansible documentation, it seems that dpkg-reconfigure can be managed by debconf module:
Code example related to locales module:
- name: Set default locale to fr_FR.UTF-8
debconf:
name: locales
question: locales/default_environment_locale
value: fr_FR.UTF-8
vtype: select
The question from openssh-server debconf module is: What do you want to do about modified configuration file sshd_config? and the answer would be: keep the local version currently installed.
How could I manage it using ansible debconf module?
This is not a debconf issue. The file is marked as a config file by Debian packaging and dpkg is handling it at a generic level. dpkg --configure has --force-confold but dpkg-reconfigure does not.
https://wiki.debian.org/ConfigPackages may also be useful.
TL;DR; Yes, use Ansible debconf but mv /var/lib/dpkg/info/<package>.config file aside whilst reconfiguring.
The rest of this is for others searching for insight into debconf and Ansible's debconf module.
I spent some time digging into this and have submitted some docs to the Ansible debconf module which I've edited a bit for this answer.
Reconfiguring packages in Debian using debconf is not straightforward!
The Ansible debconf module does not reconfigure packages, it just updates the debconf database. An additional playbook step is needed (typically via notify if debconf makes a change) to reconfigure the package and apply the changes.
Now debconf is primarily used for pre-seeding configuration prior to installation.
So, whilst dpkg-reconfigure does use debconf data, it is not always authoritative and you may need to check how your package is handled.
dpkg-reconfigure is a 3-phase process. It invokes the control scripts from the /var/lib/dpkg/info directory with the following arguments:
<package>.prerm reconfigure <version>
<package>.config reconfigure <version>
<package>.postinst control <version>
The main issue is that the <package>.config reconfigure step for many packages will first reset the debconf database (overriding changes made by the Ansible module) by checking the on-disk configuration. If this is the case for your package then dpkg-reconfigure will effectively ignore changes made by this debconf module.
However although dpkg-reconfigure finally invokes:
/var/lib/dpkg/info/<package>.postinst configure <version>
to actually configure the package; using this turns out not to be that simple. The script is expected to be run from a "debconf frontend" and uses IPC to respond to the _db_cmd statements in the script.
To see this in more detail
export DPKG_MAINTSCRIPT_PACKAGE=<package>
export DPKG_MAINTSCRIPT_NAME=<script path>
export DEBIAN_HAS_FRONTEND=1
and run the script. I was trying to setup unattended-upgrades so I ran:
sh -x /var/lib/dpkg/info/unattended-upgrades.postinst configure 1.11.2
This then halts waiting for a response from the frontend.
Running
/usr/share/debconf/frontend /var/lib/dpkg/info/unattended-upgrades.postinst configure 1.11.2
works... but has the exact same problem as dpkg-reconfigure - it resets the debconf database :(
This is because running
/var/lib/dpkg/info/unattended-upgrades.postinst configure 1.11.2
sources /usr/share/debconf/confmodule which exec()s /usr/share/debconf/frontend which forces the <package>.config configure phase to take place.
This is done based on the existence (ie using shell [-e]) of the .config file and cannot be avoided.
The solution is to mv /var/lib/dpkg/info/<package>.config out of the way whilst dpkg-reconfigure (or other related debconf code) runs.
Note the Debian programmers manual says that the config script's sole purpose is to populate debconf and must not affect other files; so doing this in a playbook is (to my understanding) compliant with debian policy: http://www.fifi.org/doc/debconf-doc/tutorial.html#AEN113
HTH
I also had this problem and I want to share my workaround.
In my case, I want non-root users to be able to sniff network traffic with wireshark/tshark. The package in question is wireshark-common which I normally reconfigure to modify dumpcap as setuid.
In my playbook, I do the following. First, use debconf to modify the config and than run the dpkg-reconfigure command in non-interactive mode, but only if the config has changed.
- name: wireshark setuid
ansible.builtin.debconf:
name: wireshark-common
question: wireshark-common/install-setuid
value: yes
vtype: boolean
register: reconfigure_changed
- name: make debconf changes active
ansible.builtin.command:
cmd: "dpkg-reconfigure wireshark-common"
environment:
DEBIAN_FRONTEND: noninteractive
when: reconfigure_changed.changed
Hope this is helpful.
I am looking myself for a solution but I haven't found one yet to achieve that with debconf and ansible.
The Problem is, debconf has no "selection" in terms of sshd_config.
When you look for debconf and preseed (Debian unattended installation) there is simply no Argument where you can specify to keep the current sshd_config.
for example active debconf settings:
sudo debconf-show openssh-server
openssh-server/permit-root-login: false
openssh-server/password-authentication: false
These are the questions for the ansible debconf module.
what we are looking for, but thats not possible:
- debconf:
name: openssh-server
question: openssh-server/keep-current-sshd-config
value: true
Unfortunately, we have to find a workaround.
For my case, I wanted to reconfigure openssh-server on my raspberry pi's
Luckily, there is a systemd file on raspbian OS /lib/systemd/system/regenerate_ssh_host_keys.service that does what the name says.
To make use of it, just delete the ssh_host_* files and reboot the machine.
If you need to get that for different hosts, you need to find another workaround. Maybe importing new ssh_host key files via ansible, or build a small script.
I have AWS EC2 ubuntu 18.04 LTS machine. I want to fix the docker vulnerabilities (USN-4048-1).
Installed package : docker.io_17.03.2-0ubuntu7~ppa1
Fixed package : docker.io_18.09.7-0ubuntu1~18.04.3
How can i do that ? What's the steps to fix it ?
The simple way is to follow below step:
If the update-notifier-common package is installed, Ubuntu will alert you about pending updates via the message of the day (motd) upon console or remote login.
After logging in, you can check for and apply new updates with:
When performing an update, first review what apt is going to do, then confirm that you want to apply the updates (this is particularly true when running the development release).
If you would prefer to have updates applied automatically, make sure the unattended-upgrades package is installed, then run 'sudo dpkg-reconfigure unattended-upgrades'. Please note that updates may restart services on your server, so this may not be appropriate for all environments.
$ sudo apt-get update
$ sudo apt-get dist-upgrade
source : https://wiki.ubuntu.com/Security/Upgrades?_ga=2.36307296.1783287754.1567592268-1506938917.1567592268
I have just started learning Ansible configuration management tool and I was going through Linux Academy tutorials to run implement ansible commands, everything was good and easy with the linux-academy servers but when I tried to replicate the same in AWS EC2 instance i was unable to locate the "cd /etc/ansible/hosts". I have installed ansible using pip command i.e., "$sudo pip install ansible". I have been tried to resolve the issue but unable to find any proper documentation. The links I tried to install and configure ansible are as follows:
http://docs.ansible.com/ansible/intro_installation.html
http://www.cyberciti.biz/python-tutorials/linux-tutorial-install-ansible-configuration-management-and-it-automation-tool/
Guide me to configure the ansible hosts path to run the ansible commands and playbooks according to my requirements.
If you are using Ubuntu EC2 instance, follow this:
http://docs.ansible.com/ansible/intro_installation.html#latest-releases-via-apt-ubuntu
If you are using Amazon Linux EC2 instance, follow this:
http://docs.ansible.com/ansible/intro_installation.html#latest-release-via-yum
Installing via these package managers will create the /etc/ansible/hosts file for you.
Steps to install Ansible on EC2 instance [RHEL-8]:
sudo dnf install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
sudo dnf config-manager --set-enabled codeready-builder-for-rhel-8-rhui-rpms
dnf install ansible
ansible --version
Use dnf for faster dependency resolution.
Note: We love RethinkDB but our current project does not use it so we need to free up resources on our local machine ...
We installed RethinkDB using homebrew:
brew update && brew install rethinkdb
And added the rethinkdb process to our plist as per the instructions in:
http://rethinkdb.com/docs/start-on-startup/
But now we need to shut it down to free-up the 8080 port for another service.
What command do we need to run? (thanks!)
Do this in the terminal
check to see if you started it using brew
$ brew services list
stop rethinkdb:
$ brew services stop rethinkdb
restart:
$ brew services start rethinkdb
Like this, I think, if you used launchctl:
sudo launchctl unload -w /Library/LaunchDaemons/com.rethinkdb.server.plist