An error caused by symbolic links pointing to each other

An error will be caused by symbolic links pointing to each other

Because thiscause a symlink loop.

Just like this:

bash-3.00$ /usr/bin/ssh
bash: /usr/bin/ssh: Number of symbolic links encountered during path name traversal exceeds MAXSYMLINKS
# /usr/local/bin/ssh
/usr/local/bin/ssh: cannot execute
# ls -lrth /usr/local/bin/ssh
lrwxrwxrwx 1 root root 18 May 31 07:05 /usr/local/bin/ssh -> /usr/local/bin/ssh
# /usr/local/bin/ssh
/usr/local/bin/ssh: cannot execute
# ls -lrth /usr/local/bin/ssh
lrwxrwxrwx 1 root root 18 May 31 07:05 /usr/local/bin/ssh -> /usr/local/bin/ssh
# ls -lrth /usr/bin/ssh
lrwxrwxrwx 1 root root 18 May 31 07:05 /usr/bin/ssh -> /usr/local/bin/ssh

Both are the symbolic links.

Logon the other nodes and copy the ssh file to it.

$ scp /usr/bin/ssh grid@perf-5240-2:/usr/bin/ssh
scp: /usr/bin/ssh: Number of symbolic links encountered during path name traversal exceeds MAXSYMLINKS

Remove the ssh symlink file from the first node.

copy again.
$ scp /usr/bin/ssh droot@perf-5240-2:/usr/bin/ssh
Password:
ssh 100% |********************************************| 259 KB 00:00
$
Then go back the first node and try the ssh command again:

# ssh
You have to specify host.
Usage: ssh [options] host [command]
Options:
-l user Log in using this user name.
-n Redirect input from /dev/null.
-F config Config file (default: ~/.ssh/config).
-A Enable authentication agent forwarding.
-a Disable authentication agent forwarding (default).
-X Enable X11 connection forwarding.
-x Disable X11 connection forwarding (default).
-i file Identity for public key authentication (default: ~/.ssh/identity)
-t Tty; allocate a tty even if command is given.
-T Do not allocate a tty.
-v Verbose; display verbose debugging messages.
Multiple -v increases verbosity.
-V Display version number only.
-q Quiet; don't display any warning messages.
-f Fork into background after authentication.
-e char Set escape character; ``none'' = disable (default: ~).
-c cipher Select encryption algorithm
-m macs Specify MAC algorithms for protocol version 2.
-p port Connect to this port. Server must be on the same port.
-L listen-port:host:port Forward local port to remote address
-R listen-port:host:port Forward remote port to local address
These cause ssh to listen for connections on a port, and
forward them to the other side by connecting to host:port.
-D port Enable dynamic application-level port forwarding.
-C Enable compression.
-N Do not execute a shell or command.
-g Allow remote hosts to connect to forwarded ports.
-1 Force protocol version 1.
-2 Force protocol version 2.
-4 Use IPv4 only.
-6 Use IPv6 only.
-o 'option' Process the option as if it was read from a configuration file.
-s Invoke command (mandatory) as SSH2 subsystem.
-b addr Local IP address.
# exit
bash-3.00$ ssh
You have to specify host.
Usage: ssh [options] host [command]
Options:
-l user Log in using this user name.
-n Redirect input from /dev/null.
-F config Config file (default: ~/.ssh/config).
-A Enable authentication agent forwarding.
-a Disable authentication agent forwarding (default).
-X Enable X11 connection forwarding.
-x Disable X11 connection forwarding (default).
-i file Identity for public key authentication (default: ~/.ssh/identity)
-t Tty; allocate a tty even if command is given.
-T Do not allocate a tty.
-v Verbose; display verbose debugging messages.
Multiple -v increases verbosity.
-V Display version number only.
-q Quiet; don't display any warning messages.
-f Fork into background after authentication.
-e char Set escape character; ``none'' = disable (default: ~).
-c cipher Select encryption algorithm
-m macs Specify MAC algorithms for protocol version 2.
-p port Connect to this port. Server must be on the same port.
-L listen-port:host:port Forward local port to remote address
-R listen-port:host:port Forward remote port to local address
These cause ssh to listen for connections on a port, and
forward them to the other side by connecting to host:port.
-D port Enable dynamic application-level port forwarding.
-C Enable compression.
-N Do not execute a shell or command.
-g Allow remote hosts to connect to forwarded ports.
-1 Force protocol version 1.
-2 Force protocol version 2.
-4 Use IPv4 only.
-6 Use IPv6 only.
-o 'option' Process the option as if it was read from a configuration file.
-s Invoke command (mandatory) as SSH2 subsystem.
-b addr Local IP address.