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Centos 6 Template

 

Config 必須要有的 settings

# 沒有它 poweroff lxc 後不應再 start
# lxc_conf - conf.c:lxc_create_tty:3822 - Read-only file system - failed to create pty #0

lxc.cap.drop = sys_admin

OS 修改:

[1]

/etc/sysconfig/init (本身有)

由

ACTIVE_CONSOLES=/dev/tty[1-6]

改成

ACTIVE_CONSOLES=/dev/tty[1-4]

Remark

會透過 /etc/init/tty.conf 及 /etc/init/start-ttys.conf 啟動 /sbin/mingetty

[2] 修改 /etc/rc.sysinit

1)

# /sbin/start_udev

否則有 Error:

/sbin/start_udev: line 260: /proc/sys/kernel/hotplug: Permission denied

2)

## Set the hostname.
#update_boot_stage RChostname
#action $"Setting hostname ${HOSTNAME}: " hostname ${HOSTNAME}

[3] Guest 的 mount

> /etc/fstab

否則會 boot fail

Logical Volume Management disabled at boot.
Checking filesystems
fsck.ext4: Unable to resolve 'UUID=...'        [FAILED]

ln -s /proc/mounts /etc/mtab

否則 df 會

df: cannot read table of mounted file systems

[4]

touch /.nolvm   # Logical Volume Management disabled at boot.

[5] /etc/init

mkdir /etc/_bak

mv /etc/init/kexec-disable.conf /etc/_bak

mv /etc/init/aliyun-service.conf /etc/_bak     # 云的 Service

[6]

echo "Welcome to LXC" > /etc/motd

/etc/ssh/sshd_config

Banner none

crontab -l

# Daily sync time
#3 4 * * *      /usr/sbin/ntpdate time.google.com &> /dev/null

[7] 加入 console Device

/etc/securetty

加入

#### LXC
lxc/console
lxc/tty1
lxc/tty2
lxc/tty3
lxc/tty4

[8] Disable IPv6

/etc/modprobe.d/blacklist.conf

# Disable IPv6
blacklist ipv6

[9] poweroff 時的 Service

/etc/init.d/halt

# Turn off swap, then unmount file systems.
#[ -f /proc/swaps ] && SWAPS=$(awk '! /^Filename/ { print $1 }' /proc/swaps)

[10] 停用 VMware Tools

rm -f /etc/modprobe.d/vmware-tools.conf

rm -f /etc/init/vmware-tools.conf

[11] 修改 log

/etc/rsyslog.conf

kern.* -/dev/null

[12] 刪除 70-persistent-net.rules

rm -f /etc/udev/rules.d/70-persistent-net.rules

建立 /etc/init/console.conf (新)

# console - getty
#
# This service maintains a getty on console from the point the system is
# started until it is shut down again.

start on stopped rc RUNLEVEL=[2345]

stop on runlevel [!2345]

respawn
exec /sbin/mingetty console

停用 Service

chkconfig udev-post off
chkconfig sendmail off
chkconfig netfs off
chkconfig lldpad off
chkconfig rpcgssd off
chkconfig fcoe off
chkconfig portreserve off

NetFS

It is a boot-time script used to mount or unmount Network File System (NFS),

Samba (SMB/CIFS), and Netware (NCP) file systems.

lldpad

Link Layer Discovery Protocol

rpcgssd

This service manages RPCSEC GSS contexts for the NFSv4 client,

which provides support on the client side for RPCSEC_GSS protocol.

It will start rpc.gssd daemon to communicate with server-side rpcsec_gss daemon rpc.svcgssd.

If using NFSv4, it is needed.

fcoe

Fiber-Channel Over Ethernet (FCoE) Service

portreserve

aims to help services with well-known ports that lie in the portmap range

It prevents portmap from a real service’s port by occupying it itself

Centos6 的 /dev

crw--w---- 1 root tty  136, 22 Aug 24 09:14 console
lrwxrwxrwx 1 root root      13 Feb 17  2012 fd -> /proc/self/fd
drwxr-xr-x 2 root root    4096 Aug 24 09:09 hugepages
prw------- 1 root root       0 Aug 24 08:39 initctl
-rw-r--r-- 1 root root      30 Aug 24 09:12 kmsg
srw-rw-rw- 1 root root       0 Aug 24 09:12 log
lrwxrwxrwx 1 root root      13 Aug 24 09:09 MAKEDEV -> /sbin/MAKEDEV
drwxr-xr-x 2 root root    4096 Aug 24 09:09 net
crw-rw-rw- 1 root root   1,  3 Apr 13  2006 null
crw-rw-rw- 1 root root   5,  2 Aug 24 09:12 ptmx
drwxr-xr-x 2 root root       0 Apr 13  2006 pts
lrwxrwxrwx 1 root root       4 Feb 17  2012 ram -> ram1
lrwxrwxrwx 1 root root       4 Feb 17  2012 ramdisk -> ram0
crw-r--r-- 1 root root   1,  8 Apr 13  2006 random
drwxrwxrwt 2 root root    4096 Aug 24 08:39 shm
lrwxrwxrwx 1 root root      15 Feb 17  2012 stderr -> /proc/self/fd/2
lrwxrwxrwx 1 root root      15 Feb 17  2012 stdin -> /proc/self/fd/0
lrwxrwxrwx 1 root root      15 Feb 17  2012 stdout -> /proc/self/fd/1
crw-rw-rw- 1 root root   5,  0 Apr 13  2006 tty
crw-rw-rw- 1 root root   4,  0 Aug 24 08:39 tty0
crw--w---- 1 root tty  136,  6 Aug 24 09:12 tty1
crw--w---- 1 root tty  136,  9 Aug 24 09:12 tty2
crw--w---- 1 root tty  136, 20 Aug 24 09:12 tty3
crw--w---- 1 root tty  136, 21 Aug 24 09:12 tty4
crw-r--r-- 1 root root   1,  9 Apr 13  2006 urandom
crw-rw-rw- 1 root root   1,  5 Apr 13  2006 zero

 

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Troubleshoot

 

[1] Boot 時 eth0 不能自動設定 IP. ifup ethX 出 error

Device eth0 does not seem to be present, delaying initialization.

原因: ifup-eth 內的 is_available ${REALDEVICE} 失敗
(此 function 在 ./network-functions 內)

Fix: 系統要 mount /sys