forked from tim/k3s-ansible
Techno Tim
56bb912bd3
k3s recommends swap be disabled on every node. Add a disable_swap toggle (default true) to the prereq role that turns swap off now and comments out the swap entries in /etc/fstab so swap stays off across reboots. The change is applied uniformly across all k3s_cluster hosts (all-or-nothing) since leaving swap on for some nodes but not others creates uneven scheduling and latency. - roles/prereq/defaults/main.yml: add disable_swap: true default - roles/prereq/tasks/main.yml: idempotent swapoff -a and fstab comment-out block gated on disable_swap - inventory/sample/group_vars/all.yml: document the new sample variable - README.md: document the disable_swap option - .github/scripts/test-disable-swap.sh: regression test - .pre-commit-config.yaml: wire the test into pre-commit Closes #670
113 lines
3.1 KiB
YAML
113 lines
3.1 KiB
YAML
---
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- name: Set same timezone on every Server
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community.general.timezone:
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name: "{{ system_timezone }}"
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when: (system_timezone is defined) and (system_timezone != "Your/Timezone")
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# k3s recommends swap be disabled on all nodes. Disabling swap is all-or-nothing
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# across the cluster: leaving it enabled on some nodes but not others creates
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# uneven scheduling/latency behavior. This block turns swap off and comments out
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# the swap entries in /etc/fstab so it stays off across reboots. It is idempotent
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# and a no-op when swap is already disabled or swapoff is unavailable.
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- name: Disable swap on all cluster nodes
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when: disable_swap
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block:
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- name: Turn off swap now
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ansible.builtin.command: swapoff -a
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register: swapoff_result
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changed_when: false
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failed_when: false
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- name: Comment out swap entries in fstab
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ansible.builtin.replace:
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path: /etc/fstab
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regexp: '^([^#][^\n]*\s+swap\s+)'
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replace: '# \\1'
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register: fstab_swap
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- name: Set SELinux to disabled state
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ansible.posix.selinux:
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state: disabled
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when: ansible_os_family == "RedHat"
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- name: Enable IPv4 forwarding
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ansible.posix.sysctl:
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name: net.ipv4.ip_forward
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value: "1"
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state: present
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reload: true
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tags: sysctl
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- name: Enable IPv6 forwarding
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ansible.posix.sysctl:
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name: net.ipv6.conf.all.forwarding
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value: "1"
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state: present
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reload: true
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tags: sysctl
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- name: Enable IPv6 router advertisements
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ansible.posix.sysctl:
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name: net.ipv6.conf.all.accept_ra
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value: "2"
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state: present
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reload: true
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tags: sysctl
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- name: Check if br_netfilter module exists
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ansible.builtin.shell: |
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set -o pipefail
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find /lib/modules/$(uname -r) -name "br_netfilter.ko*" | wc -l
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args:
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executable: /bin/bash
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register: br_netfilter_exists
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changed_when: false
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when: ansible_os_family == "RedHat"
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tags: sysctl
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- name: Install kernel-modules-extra if br_netfilter missing
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ansible.builtin.yum:
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name: kernel-modules-extra
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state: present
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update_cache: true
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register: kernel_modules_installed
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when:
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- ansible_os_family == "RedHat"
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- br_netfilter_exists.stdout | int == 0
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- name: Add br_netfilter to /etc/modules-load.d/
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ansible.builtin.copy:
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content: br_netfilter
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dest: /etc/modules-load.d/br_netfilter.conf
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mode: u=rw,g=,o=
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when: ansible_os_family == "RedHat"
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- name: Load br_netfilter
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community.general.modprobe:
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name: br_netfilter
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state: present
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when: ansible_os_family == "RedHat"
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- name: Set bridge-nf-call-iptables (just to be sure)
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ansible.posix.sysctl:
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name: "{{ item }}"
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value: "1"
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state: present
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reload: true
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when: ansible_os_family == "RedHat"
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loop:
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- net.bridge.bridge-nf-call-iptables
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- net.bridge.bridge-nf-call-ip6tables
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tags: sysctl
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- name: Add /usr/local/bin to sudo secure_path
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ansible.builtin.lineinfile:
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line: Defaults secure_path = {{ secure_path[ansible_os_family] }}
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regexp: Defaults(\s)*secure_path(\s)*=
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state: present
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insertafter: EOF
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path: /etc/sudoers
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validate: visudo -cf %s
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when: ansible_os_family in [ "RedHat", "Suse" ]
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