Fixing the octavia-diskimage-retrofit

[pedrofragola]

The current configuration uses only 1 core CPU, and to be able to convert the images it's necessary to have at least 4 cores.

[dosaboy]

@pedrofragola ive not personally had issues with creating amphora images using the current constraints. When you say "convert" are you referring to qcow2 -> raw? Do you mind providing some context on why 4 cores are necessary?

[pedrofragola]

Hey @dosaboy , in my lab, the CPU idle was 0 during the creation of the amphora image, and with the load of the VM I lost the connection to the VM a few times.
It is possible to create the VM with only 1 core, but this takes longer and the VM becomes overloaded, perhaps add at least 2 cores?

Tests from my stsstack lab using 1 core:

juju run-action --wait octavia-diskimage-retrofit/0 retrofit-image

procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
2 1 0 117880 110072 2282536 0 0 314 2917 923 3092 19 3 68 9 0
0 1 0 117872 110072 2282536 0 0 0 0 891 1570 1 1 0 98 0
0 1 0 117872 110072 2282536 0 0 0 24 862 1563 1 0 0 99 0
1 0 0 120392 110076 2282576 0 0 0 44 1288 39987 36 21 0 42 0
1 0 0 122120 109828 2282904 0 0 23932 1064 1752 28862 66 15 0 18 0
0 1 0 118088 109832 2286900 0 0 1444 2724 1173 9765 5 8 0 87 0
0 1 0 118088 109832 2286884 0 0 0 0 907 1592 2 0 0 98 0
1 0 0 114080 109848 2290936 0 0 12 4808 1226 13894 23 4 0 73 0
1 0 0 111048 109856 2291976 0 0 0 1596 1330 6977 92 4 0 4 0
0 0 0 106008 109856 2296976 0 0 4820 0 1415 21259 83 12 1 3 1
1 1 0 119568 109392 2281820 0 0 1008 52844 1109 11884 9 7 23 60 0
0 0 0 119308 109416 2281504 0 0 40 1260 1255 42076 44 17 29 10 0
1 0 0 119276 109420 2281524 0 0 4 0 1256 3903 96 1 3 0 0
0 0 0 120288 109184 2281416 0 0 17636 0 1539 16683 60 13 19 7 0
1 1 0 125036 108904 2276876 0 0 1812 100304 1130 10387 24 6 1 68 0
0 1 0 125068 108904 2276876 0 0 0 4 922 1966 1 1 0 98 0
1 0 0 123712 108920 2279416 0 0 516 2076 1333 14315 53 10 0 37 0
1 0 0 123744 108920 2279416 0 0 0 0 1361 2296 97 3 0 0 0
3 0 0 135156 108564 2268432 0 0 2416 0 1336 8277 71 7 20 2 0
1 0 0 135060 108564 2268432 0 0 0 0 1286 3176 93 2 5 0 0

PID PPID CMD %MEM %CPU
57552 56695 qemu-img convert -c -O qcow 0.2 91.4
9706 9701 /var/lib/juju/tools/machine 1.6 0.8
49358 1 /usr/bin/python3 /usr/bin/g 2.6 0.5
18 2 [kauditd] 0.0 0.4
56577 9706 /var/lib/juju/agents/unit-o 1.1 0.4
42275 1 /usr/bin/mysqlrouter -c /va 0.2 0.3
49517 49358 /usr/bin/python3 /usr/bin/g 2.5 0.3
1 0 /sbin/init 0.3 0.2
687 1 /usr/lib/snapd/snapd 0.5 0.1

After adding 4 cores the creation of the VM was faster and the VM was not overloaded.