Stile EL7

Desktop

yum -y groupinstall "Server with GUI"
systemctl set-default graphical.target

Tunnel SSH x11

https://access.redhat.com/solutions/2876371

machine id

more /etc/machine-id
systemd-machine-id-setup

systemd

systemctl --type=service --state=running
systemctl --type=service --state=failed

Journal

mkdir /var/log/journal
systemctl restart systemd-journald.service

Automount Systemd

Modifica in /etc/fstab

//host/share /mount cifs noauto,x-systemd.automount,x-systemd.after=/app,x-systemd.requires=network-online.target,x-systemd.device-timeout=10,x-systemd.idle-timeout=60,.... 0 0

Per attivare le modifiche:

systemctl daemon-reload
systemctl restart remote-fs.target
systemctl restart local-fs.target

okd kernels

package-cleanup --oldkernels --count=1

Firewall

   firewall-cmd --get-services

   firewall-cmd --permanent --new-service=oracle
   firewall-cmd --permanent --service=oracle --set-description="Listener ports 1521 2483"
   firewall-cmd --permanent --service=oracle --add-port=1521/tcp
   firewall-cmd --permanent --service=oracle --add-port=2483/tcp
   firewall-cmd --permanent --zone=public --add-service=oracle

   firewall-cmd --permanent --new-service=NRPE
   firewall-cmd --permanent --service=NRPE --set-description="NRPE port 5666"
   firewall-cmd --permanent --service=NRPE --add-port=5666/tcp
   firewall-cmd --permanent --zone=public --add-service=NRPE

   firewall-cmd --permanent --zone=public --add-service=snmp
   firewall-cmd --permanent --zone=public --add-service=ntp
   firewall-cmd --permanent --zone=public --add-service=samba

   firewall-cmd --reload

   firewall-cmd --info-service=cockpit

   firewall-cmd --list-services

Modalità diretta, sconsigliata:

   firewall-cmd --zone=public --add-port=161/tcp --permanent
   firewall-cmd --zone=public --add-port=161/udp --permanent
   firewall-cmd --zone=public --add-port=1521/tcp --permanent
   firewall-cmd --zone=public --add-port=2483/tcp --permanent
   firewall-cmd --zone=public --add-port=5666/tcp --permanent

   firewall-cmd --reload

Network

nmcli con add type 802-3-ethernet con-name eno33559296 ifname eno33559296 autoconnect yes ipv4 192.168.8.5/24 gw4 192.168.8.254 ipv4.dns 8.8.8.8 ipv4.dns-search emigar.it save yes

nmcli con show uuid 3763e4d6-d4d3-4340-bb7f-9e865f8e102e

nmcli con modify ens224 ipv4.addresses 192.168.8.5/24 ipv4.gateway 192.168.8.254

Active Directory Join

    yum -y install realmd samba samba-common oddjob oddjob-mkhomedir sssd ntpdate ntp adcli
    firewall-cmd --permanent --zone=public --add-service=samba
    firewall-cmd --reload
    ntpdate -u domain-controller.domain.it
    realm discover DOMAIN.IT
    realm join --user=administrator@domain.it DOMAIN.IT
    sed -i -e 's/use_fully_qualified_names = True/use_fully_qualified_names = False/' /etc/sssd/sssd.conf
    systemctl restart sssd

Per consentire la gestione via group policy AD (in /etc/sssd/sssd.conf):

    ad_gpo_access_control = enforcing

Version lock

Per mantenere "formalmente" una versione di RHEL

yum install yum-plugin-versionlock
yum downgrade redhat-release-server-7.2
yum versionlock add redhat-release-server-7.2
yum versionlock list
yum versionlock status

Rescue Kernel

Controllare /usr/lib/dracut/dracut.conf.d/02-rescue.conf

dracut_rescue_image="yes"

rm -f /boot/vmlinuz-0-rescue-* /boot/initramfs-0-rescue-*.img
/etc/kernel/postinst.d/51-dracut-rescue-postinst.sh $(uname -r) /boot/vmlinuz-$(uname -r)

grub2-mkconfig -o /boot/grub2/grub.cfg
grep menuentry /boot/grub2/grub.cfg

In base alle menuentry trovate, scegliere quella di default:

grub2-set-default 'Red Hat Enterprise Linux Server (3.10.0-693.5.2.el7.x86_64) 7.6 (Maipo)'

Su sistemi EFI:

grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg

Non so come si imposta il default su EFI/UEFI.

hardening

/usr/sbin/authconfig --enablefaillock --update --faillockargs='deny=6 unlock_time=1300'