Re: what is the correct way to update ceph.conf on a running cluster

[Roger Brown <rogerpbrown@xxxxxxxxx>]

The method I have used is to 1) edit ceph.conf, 2) use ceph-deploy config push, 3) restart monitors

Example:

roger@desktop:~/ceph-cluster$ vi ceph.conf    # make ceph.conf change

roger@desktop:~/ceph-cluster$ ceph-deploy --overwrite-conf config push nuc{1..3}

[ceph_deploy.conf][DEBUG ] found configuration file at: /home/roger/.cephdeploy.conf

[ceph_deploy.cli][INFO  ] Invoked (1.5.38): /usr/bin/ceph-deploy --overwrite-conf config push nuc1 nuc2 nuc3

[ceph_deploy.cli][INFO  ] ceph-deploy options:

[ceph_deploy.cli][INFO  ]  username                      : None

[ceph_deploy.cli][INFO  ]  verbose                       : False

[ceph_deploy.cli][INFO  ]  overwrite_conf                : True

[ceph_deploy.cli][INFO  ]  subcommand                    : push

[ceph_deploy.cli][INFO  ]  quiet                         : False

[ceph_deploy.cli][INFO  ]  cd_conf                       : <ceph_deploy.conf.cephdeploy.Conf instance at 0x7fbb393de3b0>

[ceph_deploy.cli][INFO  ]  cluster                       : ceph

[ceph_deploy.cli][INFO  ]  client                        : ['nuc1', 'nuc2', 'nuc3']

[ceph_deploy.cli][INFO  ]  func                          : <function config at 0x7fbb396299b0>

[ceph_deploy.cli][INFO  ]  ceph_conf                     : None

[ceph_deploy.cli][INFO  ]  default_release               : False

[ceph_deploy.config][DEBUG ] Pushing config to nuc1

[nuc1][DEBUG ] connection detected need for sudo

[nuc1][DEBUG ] connected to host: nuc1 

[nuc1][DEBUG ] detect platform information from remote host

[nuc1][DEBUG ] detect machine type

[nuc1][DEBUG ] write cluster configuration to /etc/ceph/{cluster}.conf

[ceph_deploy.config][DEBUG ] Pushing config to nuc2

[nuc2][DEBUG ] connection detected need for sudo

[nuc2][DEBUG ] connected to host: nuc2 

[nuc2][DEBUG ] detect platform information from remote host

[nuc2][DEBUG ] detect machine type

[nuc2][DEBUG ] write cluster configuration to /etc/ceph/{cluster}.conf

[ceph_deploy.config][DEBUG ] Pushing config to nuc3

[nuc3][DEBUG ] connection detected need for sudo

[nuc3][DEBUG ] connected to host: nuc3 

[nuc3][DEBUG ] detect platform information from remote host

[nuc3][DEBUG ] detect machine type

[nuc3][DEBUG ] write cluster configuration to /etc/ceph/{cluster}.conf

roger@desktop:~/ceph-cluster$ ssh nuc1

roger@nuc1:~$ sudo systemctl restart ceph-mon.target

roger@nuc1:~$ 

...etc.

On Mon, Jul 24, 2017 at 11:34 AM moftah moftah <mofta7y@xxxxxxxxx> wrote:

Hi

I am having hard time finding documentation on what is the correct way to upgrade ceph.conf in running cluster.

The change i want to introduce is this 

osd crush update on start = false

i tried to do it through the tell utility like this

ceph tell osd.82 injectargs --no-osd-crush-update-on-start

the answer was

osd_crush_update_on_start = 'false' (unchangeable)

Now it seems i need to reboot somthing to get this new config alive

I find it strange that i have to reboot all OSDs processes int he system just to update the config 

is there a procedure for this

and can i just reboot the mon process on the mon nodes ?

Thanks

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