#connections

4 one-liners with this tag.

Compare max connections with the peak so far

#mysql -e "SHOW GLOBAL STATUS LIKE 'Max_used_connections'; SHOW GLOBAL VARIABLES LIKE 'max_connections';"

harmlessMySQL and MariaDB

Count TCP connections by state

$ss -Htan | awk '{print $1}' | sort | uniq -c | sort -rn

harmlessNetwork

Count web server connections per IP address

$ss -Htn state established '( sport = :80 or sport = :443 )' | awk '{print $4}' | rev | cut -d: -f2- | rev | sort | uniq -c | sort -rn | head -20

harmlessNetwork

Show outgoing SMTP connections and their processes

#ss -Htnp state established '( dport = :25 )'

harmlessNetwork