Ceph » CephFS

I think there is slight confusion w.r.t to fd numbers of stdout and stderr.

As per /usr/include/unistd.h

/* Standard file descriptors. /
#define STDIN_FILENO 0 / Standard input. /
#define STDOUT_FILENO 1 / Standard output. /
#define STDERR_FILENO 2 / Standard error output. */

So, as per your description, the command is redirecting properly to stdout. When stdout is redirected to dev/null,
nothing is printing on console and vice versa.

[root@rook-ceph-operator-7db68b8877-hdqxp /]# ceph -c /var/lib/rook/rook-ceph/rook-ceph.config fs status 1> /dev/null
[root@rook-ceph-operator-7db68b8877-hdqxp /]# ceph -c /var/lib/rook/rook-ceph/rook-ceph.config fs status 2> /dev/null
myfs - 0 clients ====
RANK STATE MDS ACTIVITY DNS INOS
0 active myfs-a Reqs: 0 /s 10 13
0-s standby-replay myfs-b Evts: 0 /s 0 3
POOL TYPE USED AVAIL
myfs-metadata metadata 536k 82.4G
myfs-data0 data 0 82.4G
MDS version: ceph version 15.2.0 (dc6a0b5c3cbf6a5e1d6d4f20b5ad466d76b96247) octopus (rc)

Thanks,
Kotresh

Sorry my bad, this only happens when --format json is used.
Sorry for the confusing, I updated the description.

[root@rook-ceph-operator-7db68b8877-qjftc /]# ceph -c /var/lib/rook/rook-ceph/rook-ceph.config fs status --format json 1> /dev/null
{"clients": [{"clients": 0, "fs": "myfs"}], "mds_version": "ceph version 15.1.1 (4536217610b4c55c08a293e67f5ae1f1129190be) octopus (rc)", "mdsmap": [{"dns": 10, "inos": 13, "name": "myfs-a", "rank": 0, "rate": 0.0, "state": "active"}, {"dns": 5, "events": 0.0, "inos": 5, "name": "myfs-b", "rank": 0, "state": "standby-replay"}], "pools": [{"avail": 85472018432, "id": 1, "name": "myfs-metadata", "type": "metadata", "used": 524288}, {"avail": 85472018432, "id": 2, "name": "myfs-data0", "type": "data", "used": 65536}]}
[root@rook-ceph-operator-7db68b8877-qjftc /]# ceph -c /var/lib/rook/rook-ceph/rook-ceph.config fs status --format json 2> /dev/null

Yes, you are right. Sent the PR.

Greg Farnum wrote:

Kotresh, this merged to master but I'm not sure how far we need to backport it, please check and update the ticket.

The patch needs to be backported to Octopus. Nautilus doesn't have json support for "ceph fs status" command.