Network interfaces - RHCSA

1. nmcli dev status
2. nmcli dev show
3. nmcli con show
4. nmcli con add type Ethernet ifname eth0 con-name eth1 ip4 192.168.15.6/24 \ gw4 192.168.15.1
5. nmcli con reload
6. nmcli con up eth0
7. nmcli con down eth0
8. nmcli device wifi list
9. nmcli con add con-name my-con-em1 ifname em1 type ethernet \ ip4 192.168.100.100/24 gw4 192.168.100.1 ip4 1.2.3.4 ip6 abbe::cafe
10. nmcli con mod my-con-em1 ipv4.dns "8.8.8.8 8.8.4.4"
11. nmcli -g ip4.address connection show my-con-eth0

    Annotations:

    • Convenient field values retrieval for scripting
12. nmcli general permissions
13. nmcli con modify enp0s3 ipv4.address 192.168.15.11
14. man nmcli-examples

1. ip addr
2. ip addr add 192.168.15.7/24 broadcast 192.168.0.255 dev eth1
3. ifdown eth1
4. ifup eth1

Annotations:

• Listing NetworkManager polkit permissions

1. systemctl restart network
2. systemctl status network
3. /etc/sysconfig/network-scripts

   Annotations:

   • Arquivos chave de configuração de rede
   1. /etc/sysconfig/network-scripts/ifcfg-lo
   2. ifcfg-enp0s3

      Annotations:

      • ifcfg-enp0s3 TYPE=Ethernet PROXY_METHOD=none BROWSER_ONLY=no DEFROUTE=yes IPV4_FAILURE_FATAL=no IPADDR=192.168.15.50 GATEWAY=192.168.15.1 DNS1=8.8.8.8 DNS2=8.4.4.4 IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no IPV6_ADDR_GEN_MODE=stable-privacy NAME=enp0s3 UUID=c9c33a6b-3581-4db8-923c-525d6b6348a2 DEVICE=enp0s3 ONBOOT=yes
4. ping -c3 192.168.15.7

1. yum install ntp system-config-date

   Annotations:

   • instalar ntp
2. /etc/ntp.conf

   Annotations:

   • arquivo de configuração
3. ntpq -p

   Annotations:

   • lista servidores ntp

Annotations:

• https://www.certdepot.net/rhel7-configure-system-use-existing-ldap-directory-service-user-group-information/

1. Cliente
   1. yum install openldap openldap-clients nss-pam-ldap sssd authconfig
      1. #authconfig --enableldap --enableldapauth --ldapserver=ldap://server1.rhcsa.local --enablesssd --ldapbasedn="dc=rhcsa,dc=local" --update
2. Servidor
   1. yum install ipa-server bind-dyndb-ldap ipa-server-dns -y
   2. firewall-cmd --permanent --add-services={ldap,ldaps,kerberos,kpasswd,dns,ntp,http,https}
   3. kinit admin
   4. ipa user-add luizep

1. Management Commands
   1. Context management
      1. chcon
      2. matchpathcon
      3. restorecon
      4. semanage
   2. Mode management
      1. geenforce
      2. sestatus
      3. setenforce
   3. Policy Management
      1. seinfo
      2. sesearch
   4. Boolean management
      1. getsebool
      2. setsebool
   5. Troubleshooting
      1. sealert
   6. Graphical management
      1. system-config-selinux