Since we suspect the open files limit is preventing the application from executing, we can set its limit to a higher value. However, this is not as simple as executing ulimit –n; the following output is what we get when it's executed:
$ ulimit -n 1024 $ ulimit -n 5000 -bash: ulimit: open files: cannot modify limit: Operation not permitted $ ulimit -n 4096 $ ulimit -n 4096
By default, on our example system the highest the vagrant user is allowed to raise the open files limitation to is 4096. As we can see from the preceding error, anything higher is denied; but like most things with Linux we can change this.
The user limits that we have been using and modifying are part of Linux's PAM system. PAM or Pluggable Authentication Modules is a system that provides a modular authentication system.
For example, if our system was to utilize LDAP for authentication, the pam_ldap.so library would be used to provide this functionality. However, since our system uses...