Rocky Linux commands

Manage firewalld

Stuff n things

Open Port

sudo firewall-cmd --zone=public --add-port=80/tcp sudo firewall-cmd --zone=public --add-port=9987/udp

Remove port opening

sudo firewall-cmd --zone=public --remove-port=80/tcp sudo firewall-cmd --zone=public --remove-port=9987/udp

List rules etc

firewall-cmd --list-all

Enable firewalld

systemctl enable --now firewalld

Disable firewalld

systemctl disable firewalld --now

Reload firewalld

firewall-cmd --reload

Updates

dnf update

Docker install

sudo dnf install -y dnf-utils
sudo dnf config-manager --add-repo https://download.docker.com/linux/rhel/docker-ce.repo -y
sudo yum install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin -y
sudo systemctl enable docker
sudo systemctl start docker

Expand Rocky LVM disk

1. Expand in your hypervisor

fdisk /dev/sda 

1. Create new partition etc

2. Set disk type 8e, Linux LVM

3. Create PV volume (/dev/sda3 in my example)

pvcreate /dev/sda3 

1. Check what PVS you want to expand

pvs

  PV         VG Fmt  Attr PSize   PFree
  /dev/sda2  rl lvm2 a--  <63.00g     0
  /dev/sda3     lvm2 ---   36.00g 36.00g

In my case, volumegroup "rl"

1. Extend volumegroup

vgextend rl /dev/sda3

1. Check which LV you want to expand

lvdisplay

  --- Logical volume ---
  LV Path                /dev/rl/swap
  LV Name                swap
  VG Name                rl
<Removed unnecessary info>

  --- Logical volume ---
  LV Path                /dev/rl/home
  LV Name                home
  VG Name                rl
<Removed unnecessary info>

  --- Logical volume ---
  LV Path                /dev/rl/root
  LV Name                root
  VG Name                rl
<Removed unnecessary info>

in my case I want to expand "/dev/rl/root"

1. Extend

lvextend -l +100%FREE /dev/rl/root /dev/sda3

  Size of logical volume rl/root changed from <39.68 GiB (10157 extents) to 75.67 GiB (19372 extents).
  Logical volume rl/root successfully resized.

1. Resize filesystem

xfs_growfs /dev/rl/root

meta-data=/dev/mapper/rl-root    isize=512    agcount=4, agsize=2600192 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1    bigtime=1 inobtcount=1 nrext64=0
data     =                       bsize=4096   blocks=10400768, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=16384, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 10400768 to 19836928

1. Verify that /dev/mapper/rl-root has grown

df -h 

Filesystem           Size  Used Avail Use% Mounted on
devtmpfs             4.0M     0  4.0M   0% /dev
tmpfs                1.8G     0  1.8G   0% /dev/shm
tmpfs                732M  9.3M  723M   2% /run
/dev/mapper/rl-root   76G   16G   61G  20% /
/dev/sda1            960M  403M  558M  42% /boot
/dev/mapper/rl-home   20G  339M   19G   2% /home

Onboard MDE sensor

1. Download the onboarding package from security.microsoft.com

2. Transfer it to the machine

3. Download the installer script from https://github.com/microsoft/mdatp-xplat/tree/master/linux/installation

sudo dnf install yum-utils -y
sudo ./mde_installer.sh --install --channel prod --onboard MicrosoftDefenderATPOnboardingLinuxServer.py --tag GROUP MGMT --min_req -y

# Check health status (should return true)
mdatp health --field healthy
# Enable Realtime protection
mdatp config real-time-protection --value enabled
# Check if enabled 
mdatp health --field real_time_protection_enabled
# Enable PUA Protection, Available actions: off, audit, block. Default Audit. 
mdatp threat policy set --type potentially_unwanted_application --action block
# Enable behavioural monitoring
mdatp config behavior_monitoring --value enabled

htop

dnf -y install epel-release
dnf install htop -y