리눅스(linux) centos7 SSH

설치
yum install openssh-server

설치확인
whitch sshd

config 
vi /etc/ssh/sshd_config

방확벽 centos7
firewall-cmd --zone=public --add-port=22/tcp --permanent

실행
service sshd start
ps -ef | grep ssh

ssh -p 22 admin@192.168.218.102

shutdown -h now
systemctl disable firewalld

df -hP | awk 'BEGIN {printf"{\"discarray\":["}{if($1=="Filesystem")next;if(a)printf",";printf"{\"mount\":\""$6"\",\"size\":\""$2"\",\"used\":\""$3"\",\"avail\":\""$4"\",\"use%\":\""$5"\"}";a++;}END{print"]}";}'