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--- software:service:ansible [2022/09/26 08:29] – warnaud
+++ software:service:ansible [2022/09/28 13:34] (current) – [Examples] warnaud
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+====== Ansible ======
+====== Definitions ======
+===== Control node =====
+Main node where Ansible is installed and will have access via ssh to managed node\\
+Very sensible machine (access to everything) <=> reinforced security
+===== Managed node =====
+All nodes managed by Ansible. They have a user with privilege elevation and ssh connection ready for control node
+===== Inventory =====
+Inventory of the machines in ini (flat) or yaml and variable files host_vars and group_vars folders it can be static or dynamic (python), it can uses patterns
+===== Groups =====
+We can regroup machines into groups (example nginx/db/debian ...) this will classify machines in boxes and we can create a tree (origin ==  group "all")
+==== Group_vars ====
+all varaibles for the same group
+==== Host_vars ====
+in opposition to group_vars, host_vars contains variable(s) to specific host. Has precedence on group_vars where the machine is included
+===== Task =====
+one action (create user/use template/check var...) done by Ansible
+===== Module =====
+define action to a specific action (postgresql: create user/db/roles...) can be used by a task
+===== Roles =====
+it's a group of actions specific to a deployment (install nginx/configure)\\
+Has different tools to help: tasks, templates, handlers, variables, meta\\
+Tons available on the galaxy hub\\
+:!: use git/versioning system
+===== Playbook =====
+File that coordinate inventory/tasks/roles on infrastructure machine <=>groups<=> role
+===== Plugin =====
+Improves Ansible ( tests/output/...)
+====== Install ======
+===== Control node =====
+<code bash> apt install ansible</code>
+<code bash> yum install ansible || dnf install ansible</code>
+===== Managed node =====
+Python is required
+<code bash> apt install python</code>
+<code bash> yum install python || dnf install python</code>
+====== SSH ======
+===== Generate =====
+<code bash> ssh-keygen -t ecdsa</code>
+===== Install =====
+<code bash> ssh-copy-id -i ~/.ssh/id_ecdsa.yourkey user@host</code>
+===== more security =====
+Add in .ssh/authorized_keys in front of the key:
+<code perl> from="192.168.1.80" ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC0xc3q73y8Upi1irKzRAQk...</code>
+Other values:
+<code perl>from="192.168.1.?,*.fortier-family.com",no-X11-forwarding ssh-<type> Key...</code>
+===== .ssh/config =====
+<code perl>
+Host *
+    User ansible
+    IdentityFile /home/ansible/.ssh/id_rsa.ansible
+    Compression yes
+    ForwardAgent yes</code>
+    ServerAliveInterval 300
+    TCPKeepAlive no
+    ServerAliveCountMax 2
+    IPQoS=throughput
+====== Managed node user ======
+===== Create user =====
+<code bash>useradd -m ansible</code>
+===== Grant sudo =====
+<code bash>export EDITOR=vi
+visudo
+usermod -aG sudo ansible</code>
+We add user **ansible** to **sudo** OR **wheel** group
+==== test ====
+<code bash>sudo -i
+sudo -l # for a list
+</code>
+===== SSHkey =====
+<code bash> ssh localhost # to create ~/.ssh folder </code>
+<code bash>echo "ssh-rsa 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 cc.fortier-family.com">> ~/.ssh/authorized_keys</code>
+===== Check ansible connection from control node =====
+**from control node**<code bash>ansible -i "HOST," all -u ansible -m ping</code> changing **HOST** by the managed host
+<code bash> ansible -i "dns," all -u ansible -m command -a uptime --one-line</code>
+===== Examples =====
+<code bash> ansible -i "dns," all -u ansible -b -K -m apt -a "name=pkg"</code>
+Gather fact from machine
+<code bash> ansible -i "dns," all -u ansible -m setup</code>
+====== References ======
+  * [[https://www.youtube.com/playlist?list=PLn6POgpklwWoCpLKOSw3mXCqbRocnhrh-| tuto french]] - [[https://gitlab.com/xavki/presentation-ansible-fr|Commandes et sources]]
+  * [[https://docs.ansible.com| official documentation]]
+  * [[https://www.how2shout.com/linux/how-to-install-ansible-on-rocky-linux-8-or-almalinux/|Ansible Install Rocky/Alma Linux 8.X]]
+  * [[https://mitogen.networkgenomics.com/ansible_detailed.html|Mitogen]]