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");  <=========

DNS Recursive Query Fail ISSUE

Windows DNS Monitoring

• A recursive query to other DNS servers  test fail.
  Solution >>  Check  [Forwarders]

Forwarders are servers that can resolve DNS queries not answered by this server.

Forward queries for names in the following DNS domains.