After P2V (vmware Converter Standalone), RedHat Linux Server Can not boot. (Kernel panic)

After P2V (vmware Converter Standalone), RedHat Linux Server Can not boot.

error message:

setuproot: moving /dev failed: No such file or directory
mount: could not find filesystem '/dev/root'
setuproot: error mounting /proc: No such file or directory
setuproot: error mount /sys:  No such file or directory
switchroot: mount filed:  No such file or directory
Kernel panic - not syncing: Attempted to kill init!

1.  Boot from RHEL Installation media.
2.  F5    -->  linux rescue  
3. chroot /mnt/sysimage/

recover boot image.

1. backup boot image
    mv /boot/initrd-2.6.18-128.el5xen.img  backup_initrd-2.6.18-128.el5xen.img 
2. build new boot image
    /sibn/mkinitrd /boot/initrd-2.6.18-128.el5xen.img 2.6.18-128.el5xen
3. exit

reboot.

[Linux] rsh login fails with error "remuser too long"

rsh login fails with error "remuser too long"

Environment

• Red Hat Enterprise Linux 6

Issue

• rsh login fails with error "remuser too long"

Resolution

Username should be less than 16 bytes when using rsh.

Root Cause

Username limitation 16bytes can be found in rshd source code:

static void
doit(struct sockaddr_storage *fromp, socklen_t fromlen)
{
        char *cmdbuf;
        long cmdbuflen;
        const char *theshell, *shellname;
        char locuser[16], remuser[16];
...
        getstr(remuser, sizeof(remuser), "remuser");  <=========

RedHat Enterprise Linux 4 Network Bonding

1.  Edit /etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0
IPADDR=xx.xx.xx.xx

NETWORK=xx.xx.xx.xxx

NETMASK=255.255.255.0

USERCTL=no

BOOTPROTO=none

ONBOOT=yes

2.  Edit /etc/sysconfig/network-scripts/ifcfg-eth0

Device=eth0

BOOTPROTO=none

ONBOOT=yes

USERCTL=no

TYPE=Ethernet

MASTER=bond0

SLAVE=yes

3.  Edit /etc/sysconfig/network-scripts/ifcfg-eth1

Device=eth1

BOOTPROTO=none

ONBOOT=yes

USERCTL=no

TYPE=Ethernet

MASTER=bond0

SLAVE=yes

4. Edit /etc/modprobe.conf  ( RHEL 4 only, do not modify on RHEL 5 )

alias bond0 bonding

options bond0 mode=1 miimon=100

5. Module probe.

$ modprobe bonding

6. Restart network 

$ service network restart

7. Check

$ less /proc/net/bonding/bond0

Bonding Mode: fault-tolerance (active-backup)

Primary Slave: None

Currently Active Slave: eth1

MII Status: up

MII Polling Interval (ms): 100

Up Delay (ms): 0

Down Delay (ms): 0

Slave Interface: eth0

MII Status: up

Link Failure Count: 1

Permanent HW addr: 00:19:bb:21:54:c0

Slave Interface: eth1

MII Status: up

Link Failure Count: 0

Permanent HW addr: 00:19:bb:21:54:ae

---
refer:
1.  /usr/share/doc/iputils-20020927/README.bonding
2. for RHEL 5 , refer: Channel Bonding Interface

Linux Delete files before 15days

Delete files before 15 days
   find . -mtime +15 -exec rm {} \;  

Linux kernel.tainted

kernel.tainted:

Non-zero if the kernel has been tainted.  Numeric values, which can be ORed together:

   1 - A module with a non-GPL license has been loaded, this includes modules with no license.
       Set by modutils >= 2.4.9 and module-init-tools.
   2 - A module was force loaded by insmod -f.
       Set by modutils >= 2.4.9 and module-init-tools.
   4 - Unsafe SMP processors: SMP with CPUs not designed for SMP.
   8 - A module was forcibly unloaded from the system by rmmod -f.
  16 - A hardware machine check error occurred on the system.   (mcelog)
  32 - A bad page was discovered on the system.
  64 - The user has asked that the system be marked "tainted".  This could be because they are running software that directly modifies the hardware, or for other reasons.
 128 - The system has died.
 256 - The ACPI DSDT has been overridden with one supplied by the user instead of using the one provided by the hardware.
 512 - A kernel warning has occurred.
1024 - A module from drivers/staging was loaded.
2048 - The system is working around a severe firmware bug.
4096 - An out-of-tree module has been loaded.

udev

紀念 四年一次的 229... 來個小點心..

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

nic 異動時, 確認該檔內容及 udev-post service 有否正常啟動..