Sysadmin

Change default SSH port

vi /etc/ssh/sshd_config

Port 50683

/etc/init.d/ssh restart

ssh [email protected] -p 50683

Prevent root user from being able to log in via SSH

vi /etc/ssh/sshd_config

PermitRootLogin no

/etc/init.d/sshd restart

Problems installing gems in Mac OS X

If error:

clang: error: unknown argument: '-multiply_definedsuppress' [-Wunused-command-line-argument-hard-error-in-future]

Solution

• http://stackoverflow.com/questions/19638810/cant-install-debugger-gem-rails-mac-osx-mavericks

ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future gem install ...