Cara Menginstal OpenVZ Pada CentOS 5.7

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Oke udah lama ga posting nih, Dalam postingan ini saya akan menjelaskan cara menyiapkan CentOS 5,7 server untuk OpenVZ.

Apa itu OpenVZ?

Oke deh langsung aja saya jelasin,
Dengan OpenVZ anda dapat membuat beberapa Virtual Private Server (VPS) pada hardware yang sama,  mirip dengan Xen dan proyek VServer Linux. OpenVZ adalah cabang open source dari Virtuozzo, sebuah solusi virtualisasi komersial digunakan oleh banyak provider yang menawarkan server virtual. Patch kernel OpenVZ dilisensikan di bawah lisensi GPL, dan user-level alat berada di bawah lisensi qpl.

Tulisan ini  sebagai panduan praktis, yang disadur dari beberapa website lain.

Tulisan ini  saya buat tanpa jaminan apapun! Saya ingin mengatakan bahwa ini bukan satu-satunya cara untuk menyiapkan suatu sistem. Ada banyak cara untuk mencapai tujuan ini tetapi ini adalah cara yang saya ambil. Saya gak menjamin yah kalau cara saya ini berhasil pada system anda. 😀

Oke langsung aja langkah-langkah menyiapkan OpenVZ.

  1. Menginstal OpenVZ

Untuk menginstal OpenVZ, kita harus menambahkan repositori untuk yum OpenVZ, caranya sebagai berikut :

cd /etc/yum.repos.d
wget http://download.openvz.org/openvz.repo
rpm --import http://download.openvz.org/RPM-GPG-Key-OpenVZ

Setelah itu Sekarang buka openvz.repo nya… caranya :

vi openvz.repo

Jangan lupa menonaktifkan [openvz-kernel-rhel6] repositori (enabled = 0) dan mengaktifkan repositori [openvz-kernel-RHEL5] bukan (enabled = 1):

[...]
# Stable branches

[openvz-kernel-rhel6]
name=OpenVZ RHEL6-based kernel
#baseurl=http://download.openvz.org/kernel/branches/rhel6-2.6.32/current/
mirrorlist=http://download.openvz.org/kernel/mirrors-rhel6-2.6.32
enabled=0
gpgcheck=1
gpgkey=http://download.openvz.org/RPM-GPG-Key-OpenVZ

[openvz-kernel-rhel5]
name=OpenVZ RHEL5-based kernel
#baseurl=http://download.openvz.org/kernel/branches/rhel5-2.6.18/current/
mirrorlist=http://download.openvz.org/kernel/mirrors-rhel5-2.6.18
enabled=1
gpgcheck=1
gpgkey=http://download.openvz.org/RPM-GPG-Key-OpenVZ

[openvz-kernel-rhel4]
name=OpenVZ RHEL4-based kernel
#baseurl=http://download.openvz.org/kernel/branches/rhel4-2.6.9/current/
mirrorlist=http://download.openvz.org/kernel/mirrors-rhel4-2.6.9
enabled=0
gpgcheck=1
gpgkey=http://download.openvz.org/RPM-GPG-Key-OpenVZ
[...]

Repositori ini berisi kernel OpenVZ beberapa yang berbeda (Anda dapat menemukan rincian lebih lanjut tentang openVZ di sini: http://wiki.openvz.org/Kernel_flavors). Perintah

yum search ovzkernel

berisi kernel yang tersedia:

[root@server1 yum.repos.d]# yum search vzkernel
...
ovzkernel.i686 : Virtuozzo Linux kernel (the core of the Linux operating system)
ovzkernel.x86_64 : Virtuozzo Linux kernel (the core of the Linux operating system)
ovzkernel-PAE.i686 : The Linux kernel compiled for PAE capable machines.
ovzkernel-PAE-devel.i686 : Development package for building kernel modules to match the PAE kernel.
ovzkernel-devel.i686 : Development package for building kernel modules to match the kernel.
ovzkernel-devel.x86_64 : Development package for building kernel modules to match the kernel.
ovzkernel-ent.i686 : The Linux kernel compiled for huge mem capable machines.
ovzkernel-ent-devel.i686 : Development package for building kernel modules to match the ent kernel.
ovzkernel-xen.i686 : The Linux kernel compiled for Xen VM operations
ovzkernel-xen.x86_64 : The Linux kernel compiled for Xen VM operations
ovzkernel-xen-devel.i686 : Development package for building kernel modules to match the kernel.
ovzkernel-xen-devel.x86_64 : Development package for building kernel modules to match the kernel.
[root@server1 yum.repos.d]#

Pilih salah satu dari mereka dan menginstalnya sebagai berikut:

yum install ovzkernel

Jika perintah terakhir memberikan kesalahan seperti …

WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/acpi/acpi_memhotplug.ko needs unknown symbol strcpy
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/acpi/acpi_memhotplug.ko needs unknown symbol add_memory
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/acpi/acpi_memhotplug.ko needs unknown symbol swiotlb
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/acpi/acpi_memhotplug.ko needs unknown symbol memory_add_physaddr_to_nid
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/acpi/acpi_memhotplug.ko needs unknown symbol remove_memory
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/acpi/acpi_memhotplug.ko needs unknown symbol strcmp
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/acpi/acpi_memhotplug.ko needs unknown symbol acpi_get_node
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/edac/amd64_edac_mod.ko needs unknown symbol amd_unregister_ecc_decoder
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/edac/amd64_edac_mod.ko needs unknown symbol amd_register_ecc_decoder
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/edac/amd64_edac_mod.ko needs unknown symbol amd_report_gart_errors
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/edac/amd64_edac_mod.ko needs unknown symbol amd_decode_nb_mce
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/cpufreq/freq_table.ko needs unknown symbol strcpy
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/cpufreq/freq_table.ko needs unknown symbol _cpu_pda
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/edac/i7core_edac.ko needs unknown symbol edac_mce_register
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/edac/i7core_edac.ko needs unknown symbol edac_mce_unregister
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/edac/i7core_edac.ko needs unknown symbol __memcpy
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol dma_ops
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol copy_from_user
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol bad_dma_address
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol find_first_bit
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol strcat
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol mem_section
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol copy_to_user
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol strncpy
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol __memcpy
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol strcmp
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/infiniband/hw/ipath/ib_ipath.ko needs unknown symbol alloc_pages_current
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/arch/x86_64/kernel/microcode.ko needs unknown symbol copy_from_user
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/arch/x86_64/oprofile/oprofile.ko needs unknown symbol cpu_to_node
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/arch/x86_64/oprofile/oprofile.ko needs unknown symbol copy_from_user
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/arch/x86_64/oprofile/oprofile.ko needs unknown symbol copy_user_generic
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/arch/x86_64/oprofile/oprofile.ko needs unknown symbol profile_pc
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/arch/x86_64/oprofile/oprofile.ko needs unknown symbol copy_to_user
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/arch/x86_64/oprofile/oprofile.ko needs unknown symbol strcmp
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/arch/x86_64/kernel/cpufreq/powernow-k8.ko needs unknown symbol strncmp
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/arch/x86_64/kernel/cpufreq/powernow-k8.ko needs unknown symbol _cpu_pda
WARNING: /lib/modules/2.6.18-274.el5.028stab093.2/kernel/drivers/pci/hotplug/shpchp.ko needs unknown symbol strcpy

Harap remove ovzkernel

yum remove ovzkernel

dan menginstal paket ovzkernel untuk arsitektur anda:
On x86_64 systems:

yum install ovzkernel.x86_64

On i686 systems:

yum install ovzkernel.i686

Ini secara otomatis harus memperbarui bootloader GRUB juga. Pokoknya, kita harus membuka / boot / grub / menu.lst, kernel bait pertama sekarang harus berisi kernel OpenVZ baru. Pastikan bahwa nilai default adalah 0 sehingga kernel pertama (kernel OpenVZ) boot secara otomatis bukan kernel default CentOS.

vi /boot/grub/menu.lst
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,0)
# kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
# initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title OpenVZ (2.6.18-274.el5.028stab093.2)
root (hd0,0)
kernel /vmlinuz-2.6.18-274.el5.028stab093.2 ro root=/dev/VolGroup00/LogVol00 selinux=0
initrd /initrd-2.6.18-274.el5.028stab093.2.img
title CentOS (2.6.18-274.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-274.el5 ro root=/dev/VolGroup00/LogVol00
initrd /initrd-2.6.18-274.el5.img

Now we install some OpenVZ user tools:

yum install vzctl vzquota

Buka file / etc / sysctl.conf dan pastikan bahwa Anda memiliki pengaturan berikut di dalamnya:

vi /etc/sysctl.conf
[...]
net.ipv4.ip_forward = 1
net.ipv4.conf.default.proxy_arp = 0
net.ipv4.conf.all.rp_filter = 1
kernel.sysrq = 1
net.ipv4.conf.default.send_redirects = 1
net.ipv4.conf.all.send_redirects = 0
net.ipv4.icmp_echo_ignore_broadcasts=1
net.ipv4.conf.default.forwarding=1
[...]

Jika Anda perlu memodifikasi / etc / sysctl.conf, jalankan

sysctl -p

Setelah itu :

Langkah berikut adalah penting jika alamat IP dari mesin virtual Anda berasal dari subnet yang berbeda dari alamat IP sistem host. Jika Anda tidak melakukan ini, jaringan tidak akan bekerja di mesin virtual!
Buka file / etc / VZ / vz.conf dan NEIGHBOUR_DEVS set untuk semua:

vi /etc/vz/vz.conf

[...]
NEIGHBOUR_DEVS=all
[...]

SELinux harus dalam keadaan disabled jika ingin menggunakan OpenVZ. buka /etc/sysconfig/selinux dan set nilai SELINUX menjadi disabled:

vi /etc/sysconfig/selinux
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - SELinux is fully disabled.
SELINUX=disabled
# SELINUXTYPE= type of policy in use. Possible values are:
# targeted - Only targeted network daemons are protected.
# strict - Full SELinux protection.
SELINUXTYPE=targeted

Selesai,  reboot the system:

reboot

Jika sistem anda reboot tanpa masalah, maka segalanya adalah baik!

Run

uname -r

dan kernel baru Anda OpenVZ harus muncul:

[root@server1 ~]# uname -r
2.6.18-274.el5.028stab093.2
[root@server1 ~]#

Selesai… tulisan berikutnya akan membahas mengenai cara penggunaan OpenVZ 😀

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