Here are two scripts to transfer user accounts from one RedHat/CentOS server to another. All home directory files, mail, group settings, passwords stays in tact. The first script needs to be executed on the source server and the second script needs to be executed on the destination server:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
#!/bin/bash
#Run on source server
DESTSERVER = <destination_server_ip>
export UGIDLIMIT = 500
mkdir /root/usersmigrate
awk -v LIMIT = $UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/passwd > /root/usersmigrate/passwd.mig
awk -v LIMIT = $UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534)' /etc/group > /root/usersmigrate/group.mig
awk -v LIMIT = $UGIDLIMIT -F: '($3>=LIMIT) && ($3!=65534) {print $1}' /etc/passwd | tee - |egrep -f - /etc/shadow > /root/usersmigrate/shadow.mig
cp /etc/gshadow /root/usersmigrate/gshadow.mig
scp -rp /root/usersmigrate root@$DESTSERVER :/root/
tar zcvf - /home/ | ssh root@$DESTSERVER 'cd /; tar zxvf - '
tar zcvf - /var/spool/mail/ | ssh root@$DESTSERVER 'cd /; tar zxvf - '
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
#!/bin/bash
#Run on destination server
export UGIDLIMIT = 500
awk -v LIMIT = $UGIDLIMIT -F: '($3<=LIMIT) && ($3!=500)' /etc/passwd > /etc/passwdnew
awk -v LIMIT = $UGIDLIMIT -F: '($3<=LIMIT) && ($3!=500)' /etc/group > /etc/groupnew
awk -v LIMIT = $UGIDLIMIT -F: '($3<=LIMIT) && ($3!=500) {print $1}' /etc/passwd | tee - |egrep -f - /etc/shadow > /etc/shadownew
cat /root/usersmigrate/passwd.mig >> /etc/passwdnew
mv -f /etc/passwdnew /etc/passwd
cat /root/usersmigrate/group.mig >> /etc/groupnew
mv -f /etc/groupnew /etc/group
cat /root/usersmigrate/shadow.mig >> /etc/shadownew
mv -f /etc/shadownew /etc/shadow
cp /root/usersmigrate/gshadow.mig /etc/gshadow
