1.To list all the queries hitting the CloudStack database
For seeing this one must enable the general query log of mysql
mysql> show variableslike '%log%';mysql> set global general_log=ON; |
The default location of the general query log on most distributions is /var/run/mysqld/mysqld.log
2. Unable To Migrate the Instances which are with vCenter
Check if vMotion is enabled [http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1036145]
To enable vMotion1) Login to vCenter Server using the vSphere Client.2) Click the ESX host.3) Click the Configuration tab.4) Under the Hardwaresection, click Networking.5) Click Propertiesfor the virtual switchwhere a VMkernel port has been configured.6)In the dialog box that opens,select vmkernelin the Ports taband click Edit.7)To enable vMotion,select Enablednext to vMotionand click OK. |
3. How to get the CloudStack version from database?
mysql>select *from cloud.versionorder by iddesc limit 1; |
--------------------------------------+
id |
version |
updated |
step |
--------------------------------------+
2 |
3.0.1 |
2012-04-03 06:42:06 |
Complete |
--------------------------------------+
1 row in set (0.00 sec)
4. How to get the complete details of a vm instance?
mysql>select *from cloud.vm_instance; |
5. How to enable trace logging for a particular class in CloudStack?
Add the following lines to/etc/cloud/management/log4j-cloud.xml<category name="namespace.of.your.class">
<priority value="TRACE"/>
</category>
where namespace.of.your.class is the something like com.cloud.utils for example
6. How to enable the ssh in vmware esx server?
• Edit the configuration filefor SSH with the command:nano /etc/ssh/sshd_config• Find the line that starts with PermitRootLogin and change the no to yes. You can findthis line about2 pages down from the top. Save the file by first pressing Ctrl-O and then Enter.. Exit with Ctrl-X.• Restart the sshd service with the command: service sshd restart |
7. Possible causes for Host to get into Alert State are :
1) Ping times out2) Network connectivity is lost3) Primary storage didn't mount correctly4) Heart beat has failed |
8. Failed to deploy Virtual Router : Reasons
1)No capacity in hypervisor - CPU/Memory2)No ip address(public) availability3)No storage space available4)System vm template has not been properly downloaded to primary storagewhile deploying first vm in account |
9. How to enable innodb status to capture relevant db information?
1) To enable innodb logging, on every management server in the"db.properties" file add"includeInnodbStatusInDeadlockExceptions=true " to the"db.cloud.url.params" property |
10. KVM How to revert libvirt from latest version to old version Cent OS 6.1 KVM
1) Move all cent os repos to /oldrepos folder from yum.repos.d2) yum erase qemu*3) rm -rf /var/cache/yum/x86_64/6/cloud-temp/4) yum clean all5) yum erase libvirt-client6) yum install libvirt |
11. How to access router ?
1) Login to the host where Router VM is available2) Take the Link Local IP3) ssh -i ~/.ssh/id_rsa.cloud -p3922 vr-link-local-ip |
12. How to mount ISO and create Rhel repo ?
1) mkdir /root/nfssailaja2) mount -t nfs10.102.123.240:/nfs-iso-lib/ /root/nfssailaja/3) mount -o loop /root/nfssailaja/rhel-server-6.2-x86_64-dvd.iso /media/4) Create /etc/yum.repos.d/rhel6.repo with below contents |
13. Define the conserve mode which comes with network offering ?
Ans: Conserve mode meaning, we want to conserve thepublic IP address. soif it is on , then we can use onepublic ip addrfor multiple purposes like pf, lb,static nat, source nat etc.if it is off, then onepublic ip serves only one purpose. |
14. How to get Virt-manager working ?
yum groupinstall"X Window System" |
15 .KVM host cleanup steps?
1. Unmount all Primary storages2. Uninstall Agent3. Remove cloud-temp :cd /var/cache/yum/x86_64/6Server======================================cloud-temp rhelisoroot@band-cloud32 6Server# rm -rf cloud-temp/root@band-cloud32 6Server# pwd/var/cache/yum/x86_64/6Serveryum erase qemu-kvmvirsh command : list --all =>this will list all the instances created with tht hypervisordestroy <domain id>remove all linked folder with /mnt |
16. Xenserver cleanup steps?
1. Destroy all VM's : xe vm-uninstall --multiple --force2. Remove all VLAN's : cd /opt/xensource/bin ; sh cloud-clean-vlan.sh2. xe vif-unplug uuid=9e70d7f3-6b6e-9dac-36ba-9b421c8ec2dc3. xe vif-destroy uuid=9e70d7f3-6b6e-9dac-36ba-9b421c8ec2dc4. xe network-destroy uuid=c03efe07-b963-5b7d-bb5f-a0294f4682fa |
17. How to write into the attached volumes of cloudstack intances ?
1. fdisk /dev/sd*2. press"n" ->"p" ->"w" to write changes3. mkfs.ext3 /dev/sd*14. mount /dev/sd*1 <targetDir> |
18. How to Enable HTTPS for CloudStack Web Interface?
Refer the documented information @ http://support.citrix.com/article/CTX132008 |
19. How to deploy CS UserVMs with User-data?
First we need to encrypt the user data in Base64 format and later should be in URL encoded format.
Base64 encode it [Refer this link for Base64 encode/decode :http://www.base64encode.org/]
Then URL encode it. [eg:you can refer this site for URL encode/decode "http://meyerweb.com/eric/tools/dencoder/ ]
eg: deploy a VM with user data "customer-data" and your
API request should be like "http://localhost:8096/client/?command=deployVirtualMachine&serviceofferingid=1&templateid=202&zoneid=1&userdata=Y3VzdG9tZXJWTQ%3D%3D
20. How to add Rhel5 repo?
1. mkdir /root/nfssailaja2. mount -t nfs10.102.123.240:/nfs-iso-lib/ /root/nfssailaja/3. mount -o loop /root/nfssailaja/rhel-server-5-x86_64-dvd.iso /media/4. vi /etc/yum.repos.d/rhel6.repo and add below contents : Note: repomd.xml file is located under Server folder. |
21. How can I allocate a specific IP when I create an instance
1. Edit the vm ip in /var/run/cloud/<vm-name>.log file in host and restart the vm. This should update the security group rules in host.2. Change VM ipaddress in db(nics table)3. Stop the vm4. Reboot the router5. Start the vm.