On my management server:
/usr/bin/ec2-consistent-snapshot --freeze-filesystem /mnt/websites --description "FOO-DATA $(date)" vol-d84bhi64 --region eu-west-1 /mnt/websites: No such file or directory ec2-consistent-snapshot: ERROR: xfs_freeze -f /mnt/websites: failed(256)
On the server that the volume in question is attached to:
[root@foo ec2-user]# df -TH Filesystem Type Size Used Avail Use% Mounted on /dev/xvda1 ext4 8.5G 1.2G 7.2G 15% / tmpfs tmpfs 880M 50k 880M 1% /dev/shm /dev/xvdf xfs 54G 321M 54G 1% /mnt[root@foo ec2-user]# ls -al /mnt total 4 drwxr-xr-x 4 root root 45 Sep 8 12:36 . dr-xr-xr-x 22 root root 4096 Sep 13 15:07 .. drwxr-xr-x 3 mysql mysql 16 Sep 8 12:36 mysql -rw-r--r-- 1 root root 0 Sep 8 12:11 stuff drwsrwsr-x 5 someuser apache 37 Sep 21 15:41 websites
Running xfs_freeze on the machine works:
[root@fb ec2-user]# xfs_freeze -f /mnt/websites [root@fb ec2-user]# xfs_freeze -u /mnt/websites
If you use the
--xfs-filesystem) option, then the
ec2-consistent-snapshot program must be run on the instance where the file system is mounted. Otherwise, it can’t run xfs_freeze against that filesystem.
I am the author/maintainer of
ec2-consistent-snapshot. I’ll look at making this requirement clearer in the documentation.
There was a submitted patch that went a ways towards making
ec2-consistent-snapshot work on remote systems (with
ssh to run commands like
xfs_freeze). This would help reduce the existing requirement to have the AWS credentials on the instance. I forget why the patch did not get incorporated, but will take another look at it.
If you’re trying to avoid having AWS credentials on the instance, here’s an article I wrote to limit your risk:
Improving Security on EC2 With AWS Identity and Access Management (IAM)
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