Linux Containers

1. Linux Containers Jason Arneil Solutions Architect e-DBA Ltd

2. Linux Containers Types of Virtualisation Linux Containers Resource Management Demo

3. jarneil.wordpress.com @jarneil

4. About Red Stack Technology

5. Virtualisation HardwareVirtualisation SoftwareVirtualisation O/SPartitions

7. “containers can just be thought of as a collection of processes, separated from the main host processes via a set of resource namespaces and constrained via control groups resource tunables”

8. VM1 VM2 Guest O/S Guest O/S Container 1 Container 2 Virtual Machine Monitor Hypervisor O/S Virtulisation Driver Support Standard Host O/S Hardware Hardware

12. Linux Containers

13. 2.6.39-400.210.2.el6uek

15. Why?

23. Control Groups

24. cgroup

25. subsystem

26. lssubsys -am

27. cpuset /cgroup/cpusetcpu /cgroup/cpucpuacct/cgroup/cpuacctmemory /cgroup/memorydevices /cgroup/devicesfreezer /cgroup/freezernet_cls/cgroup/net_cls blkio /cgroup/blkio

28. hierachy

29. Name Spaces

30. LXC

31. LXC is a userspace interface for the Linux kernel containment features.

32. lxc-create –n cont1 –t oracle -- --release=6.latest

33. lxc-create: No config file specified, using the default config/etc/lxc/default.confHost is OracleServer6.4Create configuration file /container/cont1/configDownloading release 6.latest for x86_64Loaded plugins: refresh-packagekit, securityol6_latest | 1.4 kB 00:00 ol6_latest/primary | 33 MB 00:04 ol6_latest 22589/22589 Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package chkconfig.x86_64 0:1.3.49.3-2.el6_4.1 will be installed--> Processing Dependency: libc.so.6(GLIBC_2.2.5)(64bit) for package: chkconfig-1.3.49.3-2.el6_4.1.x86_64 --> Processing Dependency: libc.so.6(GLIBC_2.8)(64bit) for package: chkconfig-1.3.49.3-2.el6_4.1.x86_64 . .

34. Complete! Rebuilding rpm database Configuring container for Oracle Linux 6.4 Added container user:oraclepassword:oracle Added container user:rootpassword:root Container : /container/cont1/rootfs Config: /container/cont1/config Network : eth0 (veth) on virbr0 'oracle' template installed 'cont1' created

35. templates

36. ls-lh/container/cont1/ -rw-r--r--. 1 root root 2.1K Nov 25 09:06 config-rw-r--r--. 1 root root 195 Nov 25 09:06 fstabdr-xr-xr-x. 21 root root 4.0K Nov 25 09:08 rootfs

37. lxc-start -n cont1 –d

38. lxc-ls

39. lxc-info –n cont1

40. ps –elf --forest

41. root 2771 2748 0 4738 1164 0 10:04 pts/0 00:00:00 | \_ lxc-start -n cont1 root 2775 2771 0 4819 1496 0 10:04 ? 00:00:00 | \_ /sbin/init root 3005 2775 0 2291 604 0 10:04 ? 00:00:00 | \_ /sbin/dhclient -H cont1 -1 -q -lf /var/lib/dhclient/dhclient-eth0.leases -pf /var/run/dhclient-eth0.pid eth0 root 3028 2775 0 44888 1344 0 10:04 ? 00:00:00 | \_ /sbin/rsyslogd -i /var/run/syslogd.pid -c 5 root 3070 2775 0 16575 1160 0 10:04 ? 00:00:00 | \_ /usr/sbin/sshd root 3081 2775 0 1027 576 0 10:04 pts/1 00:00:00 | \_ /sbin/mingetty /dev/tty1 root 3083 2775 0 1027 572 0 10:04 pts/2 00:00:00 | \_ /sbin/mingetty /dev/tty2 root 3085 2775 0 1027 572 0 10:04 pts/3 00:00:00 | \_ /sbin/mingetty /dev/tty3 root 3087 2775 0 1027 576 0 10:04 pts/4 00:00:00 | \_ /sbin/mingetty /dev/tty4 root 3208 2775 0 1027 568 0 10:23 pts/5 00:00:00 | \_ /sbin/mingetty /dev/console

43. lxc-console -n cont1

44. lxc-clone -o cont1 –n cont2

45. Tweaking configuration Copying rootfs... Updating rootfs... 'cont2' created

46. lxc-freeze -n cont1

47. lxc-unfreeze -n cont1

48. lxc-cgroup -n cont1 state-object

49. lxc-shutdown -n cont1

50. lxc-stop -n cont1