samba and linux - changing the ip address of a mount point aka changing / remapping a samba share (windows share on linux host)

lots of pitfalls in this one, but essentially check the following;

1) the /etc/fstab, as this will give you lots of clues;
more /etc/fstab
................................
//10.3.128.132/ATT-2-QED$ /app/att/ATT-2-QUID cifs credentials=/e
tc/samba/cred_att_win,uid=wbsssssss1,gid=wbssssssphere,directio 0 0
//10.3.128.132/QED-2-ATT$ /app/att/QED-2-RAT cifs credentials=/e
tc/samba/cred_att_win,uid=wbsssssss1,gid=wbssssssphere,directio 0 0

Okay, some useful things there - it already tells you the IP of the remote windows share to mount. It also tells you there is a credentials file, so that when you come to mount the amended share, you can read this file in or use it to get the username and pw to make the command execute (more later)

2) check the smb.conf to clarify the mount

# Remote mount for ATT WebSphere read only
[websphere]
comment = ATT WebSphere Read Only Share
path = /app/WebSphere
valid users = gbwhoa
public = no
writable = no
printable = no

3) Please remember to umount the existing mount (ie in this case /app/att/ATT-2-QUID) or else you will get all sorts of pain, like trying to run the mount or smbmount command will return with

Could not resolve mount point /app/WebSphere/att/ATT-2-QED

or trying find the dir in the /app/att area will return a

ls: /app/att/ATT-2-QUID: Host is down
ls: /app/att/QED-2-RAT: Host is down

and trying to mkdir QED-2-RAT under /app/att will get
eudt0055 # mkdir ATT-2-QED
mkdir: cannot create directory `ATT-2-QUID': File exists

so remember - umount the dir!

eudt0055 # umount /app/att/ATT-2-QUID
eudt0055 # smbmount //10.3.218.132/ATT-2-QUID$ /app/att/ATT-2-QUID -o username=ATT-ATT,password=xxxxxxxx
eudt0055 # umount QED-2-RAT
eudt0055 # smbmount //10.3.218.132/QED-2-RAT$ /app/att/QED-2-RAT -o username=ATT-ATT,password=xxxxxxxx

make the change in fstab as well and then if you get the following;

eudt0055 # df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/cciss/c0d0p1 10321032 5040564 4756192 52% /
/dev/cciss/c0d0p2 6192608 160148 5717892 3% /home
none 2015508 0 2015508 0% /dev/shm
/dev/cciss/c0d0p3 6192608 348416 5529624 6% /var
/dev/cciss/c0d0p6 43175112 39522916 1458996 97% /app
df: `/app/WebSphere/att/ATT-2-QED': Permission denied
df: `/app/WebSphere/att/QED-2-ATT': Permission denied
eudt0055 #

umount the mount point and then mount it again

You can also have a 'accreditation' file, under /etc/samba, that contains password and username of user who share belongs to - the file can be called whatever you want it to be called, just vi the file and put username and password like this;

username=user
password=pass

and then in the fstab make explicit;

//10.3.128.132/ATT-2-QED$ /app/att/ATT-2-QUID cifs credentials=/e
tc/samba/cred_att_win,uid=wbsssssss1,gid=wbssssssphere,directio 0 0