I've rebooted the server (one of ceph's hosts). Started the cluster, but the osd, that's on the host, which was rebooted is down. The osd's # is 2, so when I try:

sudo /etc/init.d/ceph start osd.2

it shows:
Starting ceph (via systemctl): ceph.service.2
, but:

ceph osd tree

shows, that it's down.

When I try:

sudo start ceph-osd id=2

, it errors out:
start: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused

How can I start that osd?


After about 2 days of trying to resolve this issue and banging my head against the wall, an other person's question to the similar issue on ceph's IRC channel, has led me to a solution:

sudo systemctl start -l ceph-osd@#

where # is the number of osd on the host, that was rebooted, so I've used:

sudo systemctl start -l ceph-osd@2

Remember to log into and run this command on the node that is down.

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