Changes

== sshd keys Quota ==If you migrate from a existing backup server, you might want === 32-bit Project Identifier Support ===We need to copy the ssh host keys to the new server. If you do so clients want see a difference between the two hosts as the fingerprint remains the same. Copy the following files from the existing host to the newenable 32-bit project identifier support (PROJID32BIT feature) for our naming scheme (uid numbers larger than 65'536):* /etc/ssh/ssh_host_dsa_key* /etc/ssh/ssh_host_ecdsa_key* /etc/ssh/ssh_host_key* /etc/ssh/ssh_host_rsa_key* /etc/ssh/ssh_host_dsa_key mkfs.pub* xfs '''-i projid32bit=1''' /etcdev/ssh/ssh_host_ecdsa_key.pub* /etc/ssh/ssh_host_key.pub* /etc/ssh/ssh_host_rsa_key.pubvdb1

Set the correct permissions === Mount ===Make sure, that you have user quota (uqota) and project quota (pquota) set as options on the new host: chmod 600 chosen mount point in /etc/ssh/ssh_host_dsa_key /etc/ssh/ssh_host_ecdsa_key /etc/ssh/ssh_host_key /etc/ssh/ssh_host_rsa_keyfstab. For example: chmod 644 /etcdev/sshvdb1 /*.pubvar/backup xfs noatime,uquota,pquota 0 0

And restart === Verify ===Some important options for xfs_quota:* -x: Enable expert mode.* -c: Pass arguments on the ssh daemoncommand line. Multiple arguments may be given. Remount the file system /var/backup and check, if /var/backup has the desired values: xfs_quota -x -c state /var/backup As you can see (items marked bold), we have achieved our goal: User quota state on /var/backup (/dev/vdb1) Accounting: ''Caution'ON''' Enforcement: do not close your existing ssh session as long as you '''ON''' Inode: #131 (3 blocks, 2 extents) Group quota state on /var/backup (/dev/vdb1) Accounting: OFF Enforcement: OFF Inode: #809717 (1 blocks, 1 extents) Project quota state on /var/backup (/dev/vdb1) Accounting: '''ON''' Enforcement: '''ON''' Inode: #809717 (1 blocks, 1 extents) Blocks grace time: [7 days 00:00:30] Inodes grace time: [7 days 00:00:30] Realtime Blocks grace time: [7 days 00:00:30] === User Quotas ======= Adding a User Quota ====Set a quota of 1 Gigabyte for the user 4000187 (the values are not sure in kilobytes, so 1048576 kilobyte are 1024 megabytes which corresponds to 1 gigabyte): xfs_quota -x -c 'limit bhard=1048576k 4000187' /var/backup Or in bytes: xfs_quota -x -c 'limit bhard=1073741824 4000187' /var/backup Read the ssh daemon quota information for the user 4000187: xfs_quota -x -c 'quota -v -N -u 4000187' /var/backup  /dev/vdb1 0 0 1048576 00 [--------] /var/backup If the user has restarted properly and data in the project, that belongs to him, the result will change: /dev/vdb1 512000 0 1048576 00 [--------] /var/backup ==== Modifiying a User Quota ====To modify a users quota, you can login againjust set a new quota (limit): xfs_quota -x -c 'limit bhard=1048576k 4000187' /var/backup Read the quota information for the user 4000187: xfs_quota -x -c 'quota -v -N -u 4000187' /var/backup  /dev/vdb1 0 0 1048576 00 [--------] /var/backup If the user has data in the project, that belongs to him, the result will change: /dev/vdb1 512000 0 1048576 00 [--------] /var/backup ==== Removing a User Quota ====Removing a quota for a user: xfs_quota -x -c 'limit bhard=0 4000187' /var/backup The following command should give you an empty result: xfs_quota -x -c 'quota -v -N -u 4000187' /var/backup === Project (Directory) Quotas ======= Adding a Project (Directory) Quota ====The XFS file system additionally allows you to set quotas on individual directory hierarchies in the file system that are known as managed trees.Each managed tree is uniquely identified by a project ID and an optional project name. We'll use the following values in the examples:* project_ID: The uid of the online backup account (4000187).* project_name: The uid of the online backup account (4000187). This could be a human readable name.* mountpoint: The mountpoint of the xfs-filesystem (/var/backup). See the <code>/etc/fstab</code> entry from above.* directory: The directory of the project (187/4000187), starting from the mountpoint of the xfs-filesystem (/var/backup). Define a unique project ID for the directory hierarchy in the <code>/etc/projects</code> file (project_ID:mountpoint/directory): echo "4000187:/var/backup/187/4000187/home/4000187" >> /etc/initprojects Create an entry in the <code>/etc/projid</code> file that maps a project name to the project ID (project_name:project_ID): echo "4000187:4000187" >> /etc/projid Set Project: xfs_quota -x -c 'project -s -p /var/backup/187/4000187/home/4000187 4000187' /var/backup Set Quota (limit) on Project: xfs_quota -x -c 'limit -p bhard=1048576k 4000187' /var/backup Check your Quota (limit) xfs_quota -x -c 'quota -p 4000187' /var/backup Check the Quota:* <code>-v</code>: increase verbosity in reporting (also dumps zero values).* <code>-N</code>: suppress the initial header.* <code>-p</code>: display project quota information.* <code>-h</code>: human readable format. xfs_quota -x -c 'quota -v -N -p 4000187' /var/backup  /dev/vdb1 0 0 1048576 00 [--------] /var/backup If you copied data into the project, the output will look something like: /dev/vdb1 512000 0 1048576 00 [--------] /var/backup To give you an overall view of the whole system: xfs_quota -x -c report /var/backup <pre>User quota on /var/backup (/dev/vdb1) Blocks User ID Used Soft Hard Warn/Grace ---------- -------------------------------------------------- root 1024000 0 0 00 [--------]4000187 0 0 1048576 00 [--------] Project quota on /var/backup (/dev/vdb1) Blocks Project ID Used Soft Hard Warn/Grace ---------- -------------------------------------------------- 4000187 512000 0 1048576 00 [--------]</pre> ==== Modifying a Project (Directory) Quota ====To modify a project (directory) quota, you just set an new quota (limit) on the chosen project: xfs_quota -x -c 'limit -p bhard=1048576k 4000187' /var/backup Check your quota (limit) xfs_quota -x -c 'quota -p 4000187' /var/backup ==== Removing a Project (Directory) Quota ====Removing a quota from a project: xfs_quota -x -c 'limit -p bhard=0 4000187' /var/backup Chreck the results: xfs_quota -x -c report /var/backup <pre>User quota on /var/backup (/dev/vdb1) Blocks User ID Used Soft Hard Warn/Grace ---------- -------------------------------------------------- root 512000 0 0 00 [--------]4000187 0 0 1024 00 [--------]</pre> As you can see, the line with the Project ID 4000187 has disappeared: 4000187 512000 0 1048576 00 [--------] Don't forget to remove the project from <code>/etc/projects</code> and <code>/etc/projid</code>: sed -i -e '/4000187/d' /sshd restartetc/projects sed -i -e '/4000187/d' /etc/projid === Some important notes concerning XFS ===# The '''quotacheck''' command has no effect on XFS filesystems. The first time quota accounting is turned on (at mount time), XFS does an automatic quotacheck internally; afterwards, the quota system will always be completely consistent until quotas are manually turned off. # There is '''no need for quota file(s)''' in the root of the XFS filesystem.