The first chapter, monitoring methods
Local monitoring method
netstat -lntup |grep nginx |wc -l
lsof -i :80|wc -l
curl -s 127.0.0.1 2>/dev/null
Client analog control
wget -q 127.0.0.1 &>/dev/null
Remote port monitoring method
nmap 127.0.0.1 -p 80 |grep open |wc -l
nc -z 127.0.0.1 80