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--- services:vpshosts [2016/07/05 21:47]
dgalloway created
+++ services:vpshosts [2017/08/15 22:46] (current)
djgalloway
@@ Line 3: / Line 3: @@
 VPSHOSTs are [[hardware:mira|Miras]] we took out of the testpool to use as hypervisors for testing VMs.
-See the [[https://github.com/ceph/ceph-sepia-secrets/blob/master/ansible/inventory/sepia|vps_hosts]] section of the ansible inventory to see which miras are used as VPSHOSTs.  Or query the lock database ''teuthology-lock --brief -a | grep VPS''.
+See the [[https://github.com/ceph/ceph-sepia-secrets/blob/master/ansible/inventory/sepia|vps_hosts]] section of the ansible inventory to see which miras are used as VPSHOSTs.  Or query the lock database ''teuthology-lock %%--%%brief -a | grep VPS''.
+VPSHOSTs are managed using the [[https://github.com/ceph/ceph-cm-ansible/tree/master/roles/vmhost|vmhost]] ansible role in ceph-cm-ansible.
+===== Virtual Machines =====
+Each VPSHOST is home to <del>8</del> 4 virtual machines.  Each VM has its own JBOD disk assigned to it with 4GB RAM and 1 vCPU **except** the first VM on each VPSHOST.  It runs off the root drive.
+In June 2016, we marked down all the even-numbered VPSes and made a change to teuthology which creates the VMs with 4GB RAM as 2GB per VM wasn't meeting the needs.  See http://tracker.ceph.com/issues/15052
+===== Common Tasks =====
+==== Updating users so new users can downburst VMs ====
+<code>
+ansible-playbook common.yml --limit vps_hosts
+</code>
+==== Setting up a VPSHOST from scratch ====
+**NOTE:** This has been adapted to be applicable for 4 VPSes and disks per host.
+If setting up a host as a new or replacement VPSHOST, be sure to update your libvirt config.  See http://docs.ceph.com/teuthology/docs/downburst_vms.html#vps-hosts.
+If you install the machine using a ''-stock'' cobbler profile, you'll need to run the common role as well.
+<code>
+apt-get install xfsprogs vim
+# Determine the first and last VPS number by reading the VPSHOST's description in the lock db
+# In this example, the VPSes that live on the VPSHOST are vpm177 thru vpm184
+for sys in vpm{049,051,053,055}; do mkdir -p /srv/libvirtpool/$sys; done
+for disk in sd{b..d}; do mkfs -t xfs -f /dev/$disk; done
+## Not really needed if next task and `mount -s` succeeds
+# $num should be second VPM
+num=51; for disk in sd{b..d}; do mount /dev/$disk /srv/libvirtpool/vpm0$num; let num=num+2; done
+# OR if VPM$num is >= 100,
+num=101; for disk in sd{b..d}; do mount /dev/$disk /srv/libvirtpool/vpm$num; let num=num+2; done
+# $num should be second VPM
+num=51; for disk in sd{b..d}; do echo -e "UUID=$(blkid -s UUID -o value /dev/$disk)\t/srv/libvirtpool/vpm0$num\txfs\tdefaults,noatime,nodiratime,nobarrier,inode64,logbufs=8,logbsize=256k,largeio\t0\t0"; let num=num+2; done >> /etc/fstab
+# OR if VPM$num is >= 100,
+num=101; for disk in sd{b..d}; do echo -e "UUID=$(blkid -s UUID -o value /dev/$disk)\t/srv/libvirtpool/vpm$num\txfs\tdefaults,noatime,nodiratime,nobarrier,inode64,logbufs=8,logbsize=256k,largeio\t0\t0"; let num=num+2; done >> /etc/fstab
+# Verify fstab, then
+mount -a
+# On your workstation,
+ansible-playbook vmhost.yml --limit="mira###.front.sepia.ceph.com"
+# Run this again to fix libvirtpool permissions
+ansible-playbook vmhost.yml --limit="mira###.front.sepia.ceph.com"
+# Make sure the first VPM is down
+tl --update --status down vpm049
+# Lock the first VPM on the host to download disk images
+tl --lock --os-type ubuntu --os-version 14.04 ubuntu@vpm049
+tl --unlock ubuntu@vpm049
+tl --lock --os-type ubuntu --os-version 16.04 ubuntu@vpm049
+tl --unlock ubuntu@vpm049
+tl --lock --os-type centos --os-version 7.3 ubuntu@vpm049
+tl --unlock ubuntu@vpm049
+# Copy the disk image to the other libvirtpools
+for dir in $(ls /srv/libvirtpool/ | tail -n 3); do cp /srv/libvirtpool/$(ls /srv/libvirtpool/ | head -n 1)/{ubuntu*,centos*} /srv/libvirtpool/$dir/; done
+for pool in $(ls /srv/libvirtpool/); do virsh pool-refresh $pool; done
+# Lock then unlock all the VPSes to verify everything looks good
+for sys in vpm{049,051,053,055}; do tl --lock ubuntu@$sys; done
+for sys in vpm{049,051,053,055}; do tl --unlock ubuntu@$sys; done
+</code>
+==== Replace bad VPSHOST disk ====
+<code>
+# Mark the VM down
+teuthology-lock --update --status down vpm###
+# On the VPSHOST,
+umount $bad_disk
+# Comment out bad disk in /etc/fstab
+# Physically replace the disk
+# Create a new filesystem on the new disk
+mkfs -t xfs /dev/$new_disk
+# Mount the new disk partition to the VM's libvirtpool mount
+mount /dev/$new_disk /srv/libvirtpool/vpm###
+# Obtain the new UUID
+lsblk -o name,uuid,mountpoint
+# Replace the old UUID in /etc/fstab
+# Mark the VM back up
+teuthology-lock --update --status up vpm###
+</code>

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