// Commands to gather OS level (systemd) data

// Collect Linux processes and system real-time information with top. This command includes the
// -b flag for batch (needed to redirect to a file) and the -n flag to specify the number of iterations. 
// This command will run for 18 seconds, and send the output to the specified file

top -b -n 5 > top-output.txt

// Check memory usage

free -ht

// Check file system disk space usage

df -h

// Check open tcp connections. requires sudo or root access

sudo ss -tnlp

// Check for open files. Requires sudo or root access. lsof might not be installed; 
// there is no tidy equivalent.

sudo lsof -p $(pgrep vault) > lsof-vault-output.txt

// if lsof cannot be installed, try:

    // to get PID of vault

    pgrep vault

    // to list the file descriptors for the vault processes. requires sudo or root access
    // update <pidof_vault> to the output from pgrep command.

       sudo ls -l /proc/<pidof_vault>/fd > proc-vault-ls-output.txt

// Collect vault server operational logs

journalctl -b --no-pager -u vault | gzip -9 > /tmp/"$(hostname)-$(date +%Y-%m-%dT%H-%M-%SZ)-vault.log.gz"