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Import configure-swap role from openstack-zuul-jobs
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‎configure-swap/README.rst‎

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Configure a swap partition
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Creates a swap partition on the ephemeral block device (the rest of which
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will be mounted on /opt).
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**Role Variables**
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.. zuul:rolevar:: configure_swap_size
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:default: 1024
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The size of the swap partition, in MiB.

‎configure-swap/defaults/main.yaml‎

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# Default swap partition/file size, in MiB
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configure_swap_size: 1024

‎configure-swap/tasks/ephemeral.yaml‎

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---
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# Configure attached ephemeral devices for storage and swap
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- name: Assert that ephemeral_device is defined
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assert:
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that:
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- "ephemeral_device is defined"
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- name: Set partition names
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set_fact:
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swap_partition: "{{ ephemeral_device }}1"
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opt_partition: "{{ ephemeral_device }}2"
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- name: Ensure ephemeral device is unmounted
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become: yes
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ansible.posix.mount:
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name: "{{ ephemeral_device }}"
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state: "{{ item }}"
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with_items:
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- unmounted
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- absent
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# ^ https://github.com/ansible/ansible/issues/48313
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- name: Get existing partitions
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become: yes
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community.general.parted:
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device: "{{ ephemeral_device }}"
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unit: MiB
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register: ephemeral_partitions
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- name: Remove any existing partitions
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become: yes
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community.general.parted:
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device: "{{ ephemeral_device }}"
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number: "{{ item.num }}"
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state: absent
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with_items:
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- "{{ ephemeral_partitions.partitions }}"
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- name: Create new disk label
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become: yes
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community.general.parted:
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label: msdos
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device: "{{ ephemeral_device }}"
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- name: Create swap partition
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become: yes
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community.general.parted:
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device: "{{ ephemeral_device }}"
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number: 1
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state: present
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part_start: '0%'
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part_end: "{{ configure_swap_size }}MiB"
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- name: Create opt partition
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become: yes
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community.general.parted:
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device: "{{ ephemeral_device }}"
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number: 2
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state: present
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part_start: "{{ configure_swap_size }}MiB"
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part_end: "100%"
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- name: Make swap on partition
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become: yes
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command: "mkswap {{ swap_partition }}"
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- name: Write swap to fstab
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become: yes
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ansible.posix.mount:
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path: none
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src: "{{ swap_partition }}"
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fstype: swap
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opts: sw
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passno: 0
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dump: 0
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state: present
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# XXX: does "parted" plugin ensure the partition is available
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# before moving on? No udev settles here ...
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- name: Add all swap
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become: yes
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command: swapon -a
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- name: Create /opt filesystem
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become: yes
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community.general.filesystem:
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fstype: ext4
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# The default ratio is 16384 bytes per inode or so. Reduce that to 8192
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# bytes per inode so that we get roughly twice the number of inodes as
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# by default. This should still be well above the block size of 4096.
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# We do this because we have found in at least a couple locations that
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# more inodes is useful and is painful to fix after the fact.
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opts: -i 8192
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dev: "{{ opt_partition }}"
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# Rackspace at least does not have enough room for two devstack
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# installs on the primary partition. We copy in the existing /opt to
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# the new partition on the ephemeral device, and then overmount /opt
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# to there for the test runs.
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#
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# NOTE(ianw): the existing "mount" touches fstab. There is currently (Sep2017)
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# work in [1] to split mount & fstab into separate parts, but for now we bundle
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# it into an atomic shell command
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# [1] https://github.com/ansible/ansible/pull/27174
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- name: Copy old /opt
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become: yes
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register: moving_opt
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shell: |
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mount {{ opt_partition }} /mnt
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find /opt/ -mindepth 1 -maxdepth 1 -print -exec mv {} /mnt/ \;
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umount /mnt
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df -h
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tags:
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- skip_ansible_lint
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- name: Output data from old /opt
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debug:
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var: moving_opt
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# This overmounts any existing /opt
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- name: Add opt to fstab and mount
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become: yes
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ansible.posix.mount:
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path: /opt
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src: "{{ opt_partition }}"
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fstype: ext4
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opts: noatime
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state: mounted

‎configure-swap/tasks/main.yaml‎

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---
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# On RAX hosts, we have a small root partition and a large,
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# unallocated ephemeral device attached at /dev/xvde
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- name: Set ephemeral device if /dev/xvde exists
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when: ansible_devices["xvde"] is defined
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set_fact:
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ephemeral_device: "/dev/xvde"
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# On other providers, we have a device called "ephemeral0".
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#
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# NOTE(ianw): Once [1] is in our ansible (2.4 era?), we can figure
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# this out more directly by walking the device labels in the facts
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#
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# [1] https://github.com/ansible/ansible/commit/d46dd99f47c0ee5081d15bc5b741e9096d8bfd3e
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- name: Set ephemeral device by label
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when: ephemeral_device is undefined
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block:
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- name: Get ephemeral0 device node
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command: /sbin/blkid -L ephemeral0
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register: ephemeral0
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# rc !=0 is expected
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failed_when: False
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changed_when: False
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- name: Set ephemeral device if LABEL exists
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when: "ephemeral0.rc == 0"
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set_fact:
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ephemeral_device: "{{ ephemeral0.stdout }}"
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# If we have ephemeral storage and we don't appear to have setup swap,
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# we will create a swap and move /opt to a large data partition there.
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- name: Setup swap on ephemeral storage
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include_tasks: ephemeral.yaml
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when:
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- ephemeral_device is defined
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- ansible_memory_mb['swap']['total'] | int + 10 <= configure_swap_size
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# If no ephemeral device and no swap, then we will setup some swap
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# space on the root device to ensure all hosts a consistent memory
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# environment.
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- name: Setup swap file on root device
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include_tasks: root.yaml
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when:
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- ephemeral_device is undefined
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- ansible_memory_mb['swap']['total'] | int + 10 <= configure_swap_size
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# ensure a standard level of swappiness. Some platforms
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# (rax+centos7) come with swappiness of 0 (presumably because the
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# vm doesn't come with swap setup ... but we just did that above),
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# which depending on the kernel version can lead to the OOM killer
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# kicking in on some processes despite swap being available;
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# particularly things like mysql which have very high ratio of
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# anonymous-memory to file-backed mappings.
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#
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# This sets swappiness low; we really don't want to be relying on
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# cloud I/O based swap during our runs if we can help it
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- name: Set swappiness
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become: yes
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ansible.posix.sysctl:
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name: vm.swappiness
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value: 30
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state: present
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- name: Debug the ephemeral_device variable
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debug:
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var: ephemeral_device

‎configure-swap/tasks/root.yaml‎

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---
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# If no ephemeral devices are available, use root filesystem
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- name: Calculate required swap
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set_fact:
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swap_required: "{{ configure_swap_size - ansible_memory_mb['swap']['total'] | int }}"
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- name: Get root filesystem
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block:
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- name: Get root filesystem
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shell: df --output='fstype' /root | tail -1
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register: root_fs
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- name: Save root filesystem
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set_fact:
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root_filesystem: "{{ root_fs.stdout }}"
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- name: Debug the root_filesystem variable
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debug:
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var: root_filesystem
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# Note, we don't use a sparse device to avoid wedging when disk space
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# and memory are both unavailable.
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- name: Create swap backing file
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become: yes
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command: dd if=/dev/zero of=/root/swapfile bs=1M count={{ swap_required }}
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args:
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creates: /root/swapfile
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- name: Ensure swapfile perms
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become: yes
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file:
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path: /root/swapfile
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owner: root
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group: root
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mode: '0600'
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- name: Make swapfile
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become: yes
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command: mkswap /root/swapfile
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- name: Write swap to fstab
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become: yes
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ansible.posix.mount:
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path: none
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src: /root/swapfile
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fstype: swap
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opts: sw
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passno: 0
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dump: 0
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state: present
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- name: Add all swap
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become: yes
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command: swapon -a
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- name: Debug the swap_required variable
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debug:
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var: swap_required

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