Comment 0 for bug 1945688

To cope with slow VM provisioning on MAAS, I provision many machines ahead of time (`juju add-machine`). This way I don't have to wait too much when deploying units as juju usually picks a machine that's already "deployed".

Sometimes, juju decides to put the newly deployed unit on a machine that is still provisioning:

$ juju deploy ./lxd_ubuntu-20.04-amd64.charm
Located local charm "lxd", revision 35
Deploying "lxd" from local charm "lxd", revision 35

$ juju status
Model Controller Cloud/Region Version SLA Timestamp
test overlord maas/default 2.9.14 unsupported 18:07:05Z

App Version Status Scale Charm Store Channel Rev OS Message
https-client active 1 https-client local 35 ubuntu
lxd waiting 0/1 lxd local 35 ubuntu waiting for machine

Unit Workload Agent Machine Public address Ports Message
https-client/45* active idle 81 2602:fc62:b:1018:0:1:0:5
lxd/26 waiting allocating 100 2602:fc62:b:1018:0:1:0:e waiting for machine

Machine State DNS Inst id Series AZ Message
81 started 2602:fc62:b:1018:0:1:0:5 cloud-vm09 focal default Deployed
83 started 2602:fc62:b:1018:0:1:0:9 cloud-vm15 focal default Deployed
86 started 2602:fc62:b:1018:0:1:0:7 cloud-vm05 focal default Deployed
89 started 2602:fc62:b:1018:0:1:0:6 cloud-vm08 focal default Deployed
90 started 2602:fc62:b:1018:0:1:0:f cloud-vm02 focal default Deployed
91 started 2602:fc62:b:1018:0:1:0:2 cloud-vm07 focal default Deployed
92 started 2602:fc62:b:1018:0:1:0:3 cloud-vm10 focal default Deployed
94 started 2602:fc62:b:1018:0:1:0:d cloud-vm11 focal default Deployed
95 started 2602:fc62:b:1018:0:1:0:12 cloud-vm14 focal default Deployed
96 started 2602:fc62:b:1018:0:1:: cloud-vm01 focal default Deployed
97 started 2602:fc62:b:1018:0:1:0:c cloud-vm03 focal default Deployed
98 started 2602:fc62:b:1018:0:1:0:13 cloud-vm12 focal default Deployed
99 pending 2602:fc62:b:1018:0:1:0:b cloud-vm04 focal default Deploying: Configuring OS
100 pending 2602:fc62:b:1018:0:1:0:e cloud-vm06 focal default Deploying: Configuring OS
101 pending 2602:fc62:b:1018:0:1:0:14 cloud-vm13 focal default Deploying: Configuring OS

It should always any available machine that's already deployed, not one still deploying. It usually gets this right but not always, or maybe it's random and I am usually lucky ;)

Additional information:

$ juju --version
2.9.15-ubuntu-amd64