increase-swap-partition.yml

---
# pseudocode:
# reboot to get new disk size
# get info on existing swap: swapon -s
# TURN OFF swap: swapoff -a
# fstab grep swap && reuse UUID so no modify fstab

# NOTE this script relies on swap being on sdb1, and only 1 swap partition

- hosts: testvms
  tasks:

  - name: install parted pkg if missing
    package:
      name: parted
      state: present

  - name: get swapinfo - partition size b4
    shell: "swapon -s > /root/swapinfo.txt"

# straight up copied from patch
  - name: reboot server to get latest disk size
    reboot:
      reboot_timeout: 600
      test_command: uptime
      post_reboot_delay: 45

  - name: turn swap off
    shell: swapoff -a

  - name: VERIFY swap off
    shell: "free |awk '{print $2}' > /root/swapalloc.txt"
    args:
      creates: /root/swapalloc.txt
# TODO - print $2 and fail !=0

  - name: reuse existing swap uuid - get UUID from fstab instead of blkid, less trouble
    shell: "grep swap /etc/fstab |head -n 1 |awk '{print $1}' > /root/blkidswapinfo.txt"
#    shell: "blkid |grep swap |head -n 1 |awk '{print $2}' > /root/blkidswapinfo.txt"
    args:
      creates: /root/blkidswapinfo.txt
# expected result:
# UUID=BLAH

# TODO Fail if swap not on sdb

  - name: delete existing swap on sdb
    parted:
      device: /dev/sdb
      number: 1
      state: absent

# have to shell this because parted module not support swap
  - name: create new swap partition using all space on sdb
    shell: "parted -s /dev/sdb mkpart primary linux-swap 1MiB 100%"

  - name: verify new partition
    shell: parted -s /dev/sdb1 print
    register: partedprintout

  - debug: msg="DEBUG {{ partedprintout.stdout }}"

#  - name: create new partition with existing blkid
#    parted:
#      device: /dev/sdb
#      number: 1
#      part_type: primary
#      part_start: 0%
#      part_end: 100%
#      state: present

#  - name: change partid to 82/swap
#    shell: |
#      "parted -s /dev/sdb1 print"
#      "parted -s /dev/sdb1 set swap on"
#      "parted -s /dev/sdb1 print"

  - name: replace UUID=blah and get just blah
    replace:
      path: /root/blkidswapinfo.txt
      regexp: "{{ item }}"
      replace: ''
    with_items:
    - 'UUID='
#    - '"'

  - name: turn swap off AGAIN JIC, cuz WE WERE GETTING ERRORS THAT IT WAS STILL MOUNTED!!!
    shell: swapoff -a
    become: true

  - name: remake swap partition with old UUID / no fstab changes
    shell: mkswap -U $(awk '{print $1}' /root/blkidswapinfo.txt) /dev/sdb1

  - name: verify swap from blkid
    shell: "blkid |grep swap"
    register: blkidoutput

  - debug: msg="DEBUG {{ blkidoutput.stdout }}"

  - name: turn swap back on
    shell: swapon -a

  - name: verify changes
    shell: swapon -s
    register: swaponS

  - debug: msg="DEBUG {{ swaponS.stdout }}"

  - name: verify changes2
    shell: free
    register: swaponS

  - debug: msg="DEBUG {{ swaponS.stdout }}"

# - name: cleanup

##################
# Author: dave.bechtel@asmr
# script to delete and expand existing swap partition on sdb1
# 2020.0820 alpha ver
# 2020.0821 got it working in test env