RedHat

RHEL subscription:

sudo subscription-manager register
sudo subscription-manager attach
sudo yum update

YUM:

yum update              # update packets
    install <packet>    # install packet
        -y              # yes for all ansvers
    search <packet>     # search packet
    info htop           # show info

yum install epel-release yum install htop

CentOS yum

yum install epel-release yum install htop

CentOS yum via proxy:

/etc/yum.conf.
    proxy=http://192.168.35.10:8080
    proxy_username=proxyname
    proxy_password=proxypass

RedHat firewall

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Security_Guide/sec-Using_Firewalls.html

# start/stop firewall sudo systemctl disable firewalld sudo systemctl stop firewalld sudo systemctl status firewalld

cat /etc/redhat-release # show version of redhat

ip addr # analog ifconfig’a yum install net-tools # install ifconfig

# start/stop firewall sudo systemctl disable firewalld sudo systemctl stop firewalld sudo systemctl status firewalld

# Change timezone sudo mv /etc/localtime /etc/localtime.old sudo ln -s /usr/share/zoneinfo/Europe/Kiev /etc/localtime

# login at another user su - <username>