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OpenVZ commands and its Usages.

OpenVZ:

OpenVZ is an operating system-level virtualization technology based on the Linux operating system.OpenVZ allows a physical server to run multiple isolated operating systems called virtual private servers.

Commands :

  • Command to list the running VPS list

# vzlist

Example:

# vzlist

CTID NPROC STATUS IP_ADDR HOSTNAME

106 104 running xx.xx.xx.xx server1.test.com

107 46 running xx.xx.xx.xx server2.test.com

108 83 running xx.xx.xx.xx server3.test.com

  • Command to list running and stopped VPSs in a node

# vzlist -a

Example:

# vzlist -a

CTID NPROC STATUS IP_ADDR HOSTNAME

106 104 running xx.xx.xx.xx server1.test1.com

107 46 running xx.xx.xx.xx server2.test2.com

109 86 running xx.xx.xx.xx server4.test4.com

110 – stopped xx.xx.xx.xx server5.test5.com

  • To start VPS

# vzctl start CTID

Example:

    # vzctl start 110

  • To shut down VPS

# vzctl stop CTID

Example:

    # vzctl stop 110

  • To view the status of a VPS

# vzctl status CTID

Example:

    # vzctl status 110

  • To enter a VPS

# vzctl enter CTID

Example:

    # vzctl enter 106

       Entered into CT 106

  • Set hostname for a Server

# vzctl set CTID –hostname New_hostname –save

  • Add new IP to VPS

# vzctl set CTID –ipadd xx.xx.xx.xx –save

  • Delete IP from VPS

# vzctl set CTID –ipdel xx.xx.xx.xx –save

  • Reset root password of a VPS

# vzctl set CTID –userpasswd root:new_password –save

  • To add NameServer IPs to VPS

# vzctl set CTID –nameserver xx.xx.xx.xx –save

  • Delete a container

# vzctl destroy CTID

  • Suspending a container

# vzctl suspend CTID

For more information visit-Ideastack

What is OpenVZ and what is the use of OpenVZ?

OpenVZ:

Cheap OpenVZ VPS

  1. Linux Operating System OpenVZ allows a physical server to run multiple isolated operating systems called Virtual Private Servers.
  2. It comes with hard memory limits and instead of offering SWAP space it instead offers burstable memory. This burstable memory is only used when it’s available to be utilized on the server.

Uses of OpenVZ:

Use of OpenVZ VPS

Since it is lightweight, OS virtualization offers several benefits over machine/ hardware virtualization:

  1. It is much more efficient
  2. It scales better
  3. It offers much greater machine density
  4. It offers a larger number of resource management parameters
  5. Resource management is dynamic so no container restart is needed

OpenVZ can achieve better performance, scalability, and density because there is a single Linux kernel running on the physical host with each container only taking up the resources necessary for running the processes/ services you want inside them without all of the overhead of a full operating system.

Another advantage of OpenVZ is that it offers a wide range of dynamic resource management parameters including several for memory usage, the number of processes, CPU usage, disk space usage, etc all of which may be changed while the container is running.

For more information visit Ideastack.