[ceph-users] Re: How does client get the new active ceph-mgr endpoint when failover happens?
Hi, do clients (as in ceph clients like rbd/cephfs/rgw) connected to the mgr at all? IMHO the clients only need to be able to connect to the mon (host list in ceph.conf / DNS SRV entries) and osd (osd map in mons). If certain clients need to retrieve data from the mgr (e.g. cephfs-top, rbd iostat), I would assume they will use the mgr map from the mons, which will be updated if the active mgr changes. I'm not sure whether these clients use permanent connections (which will need to be reestablished if mgr changes), or whether they will work with a request-reply-model. Regards, Burkhard Linke ___ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
[ceph-users] Re: How does client get the new active ceph-mgr endpoint when failover happens?
> Thanks for the quick response! > > What if the node is down? The client cannot even connect to the mgr. Then this mgr would not be in the list of possible mgrs to connect to at all. -- May the most significant bit of your life be positive. ___ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
[ceph-users] Re: How does client get the new active ceph-mgr endpoint when failover happens?
Thanks for the quick response! What if the node is down? The client cannot even connect to the mgr. On Thu, Oct 6, 2022 at 2:17 AM Janne Johansson wrote: > Den tors 6 okt. 2022 kl 10:40 skrev Zhongzhou Cai >: > > Hi folks, > > I have ceph-mgr bootstrapped on three nodes, and they are running in HA. > > When the active mgr node goes down, it will failover to one of the > > standbys. I'm wondering if there is a way for the client to be aware of > the > > leadership change and connect to the new active mgr? Do I need to set up > > something like haproxy in front of the ceph-mgr daemons? > > No, I think the mgr you connect to will send the client to the active > one if it is passive. > In the very beginning you needed an internal LB, but this was long ago. > > "By default, the standby modules will answer incoming requests with a > HTTP redirect to the active manager, allowing users to point their > browser at any mgr node and find their way to an active mgr." > from https://docs.ceph.com/en/latest/mgr/administrator/ > > -- > May the most significant bit of your life be positive. > -- Thanks, Zhongzhou Cai ___ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
[ceph-users] Re: How does client get the new active ceph-mgr endpoint when failover happens?
Den tors 6 okt. 2022 kl 10:40 skrev Zhongzhou Cai : > Hi folks, > I have ceph-mgr bootstrapped on three nodes, and they are running in HA. > When the active mgr node goes down, it will failover to one of the > standbys. I'm wondering if there is a way for the client to be aware of the > leadership change and connect to the new active mgr? Do I need to set up > something like haproxy in front of the ceph-mgr daemons? No, I think the mgr you connect to will send the client to the active one if it is passive. In the very beginning you needed an internal LB, but this was long ago. "By default, the standby modules will answer incoming requests with a HTTP redirect to the active manager, allowing users to point their browser at any mgr node and find their way to an active mgr." from https://docs.ceph.com/en/latest/mgr/administrator/ -- May the most significant bit of your life be positive. ___ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
