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August 27, 2023 1 min read Docs

SysAdmin Docs Systems Unix-Like Networks

Basic Troubleshooting Checks interfaces 1nmcli con show 2NAME UUID TYPE DEVICE 3ens192 4d0087a0-740a-4356-8d9e-f58b63fd180c ethernet ens192 4ens224 3dcb022b-62a2-4632-8b69-ab68e1901e3b ethernet ens224 5 6nmcli dev status 7DEVICE TYPE STATE CONNECTION 8ens192 ethernet connected ens192 9ens224 ethernet connected ens224 10ens256 ethernet connected ens256 11lo loopback unmanaged -- 12 13# Get interfaces details : 14nmcli connection show ens192 15nmcli -p con show ens192 16 17# Get DNS settings in interface 18UUID=$(nmcli --get-values connection.uuid c show "cloud-init eth0") 19nmcli --get-values ipv4.dns c show $UUID Changing Interface name 1nmcli connection add type ethernet mac "00:50:56:80:11:ff" ifname "ens224" 2nmcli connection add type ethernet mac "00:50:56:80:8a:0b" ifname "ens256" Create a custom config 1nmcli con load /etc/sysconfig/network-scripts/ifcfg-ens224 2nmcli con up ens192 Adding a Virtual IP 1nmcli con mod enp1s0 +ipv4.addresses "192.168.122.11/24" 2ip addr del 10.163.148.36/24 dev ens160 3 4nmcli con reload # before to reapply 5nmcli device reapply ens224 6systemctl status network.service 7systemctl restart network.service Add a DNS entry 1UUID=$(nmcli --get-values connection.uuid c show "cloud-init eth0") 2DNS_LIST=$(nmcli --get-values ipv4.dns c show $UUID) 3nmcli conn modify "$UUID" ipv4.dns "${DNS_LIST} ${DNS_IP}" 4 5# /etc/resolved is managed by systemd-resolved 6sudo systemctl restart systemd-resolved

August 26, 2023 2 min read Docs

🎶 Samba / CIFS

SysAdmin Docs Systems Unix-Like Disks Shared-Storage

Server Side First Install samba and samba-client (for debug + test) /etc/samba/smb.conf 1[home] 2Workgroup=WORKGROUP (le grp par defaul sur windows) 3Hosts allow = ... 4[shared] 5browseable = yes 6path = /shared 7valid users = user01, @un_group_au_choix 8writable = yes 9passdb backend = tdbsam #passwords are stored in the /var/lib/samba/private/passdb.tdb file. Test samba config testparm /usr/bin/testparm -s /etc/samba/smb.conf smbclient -L \192.168.56.102 -U test : list all samba shares available smbclient //192.168.56.102/sharedrepo -U test : connect to the share pdbedit -L : list user smb (better than smbclient)

Read more about 🏭 Docker.

August 1, 2023 3 min read Docs

🐋 Azure

Devops Docs Cloud Providers

Create a small infra for kubernetes 1 #On your Azure CLI 2 az --version # Version expected 2.1.0 or higher 3 4 az group delete --name kubernetes -y 5 6 az group create -n kubernetes -l westeurope 7 8 az network vnet create -g kubernetes \ 9 -n kubernetes-vnet \ 10 --address-prefix 10.240.0.0/24 \ 11 --subnet-name kubernetes-subnet 12 13 az network nsg create -g kubernetes -n kubernetes-nsg 14 15 az network vnet subnet update -g kubernetes \ 16 -n kubernetes-subnet \ 17 --vnet-name kubernetes-vnet \ 18 --network-security-group kubernetes-nsg 19 20 az network nsg rule create -g kubernetes \ 21 -n kubernetes-allow-ssh \ 22 --access allow \ 23 --destination-address-prefix '*' \ 24 --destination-port-range 22 \ 25 --direction inbound \ 26 --nsg-name kubernetes-nsg \ 27 --protocol tcp \ 28 --source-address-prefix '*' \ 29 --source-port-range '*' \ 30 --priority 1000 31 32 az network nsg rule create -g kubernetes \ 33 -n kubernetes-allow-api-server \ 34 --access allow \ 35 --destination-address-prefix '*' \ 36 --destination-port-range 6443 \ 37 --direction inbound \ 38 --nsg-name kubernetes-nsg \ 39 --protocol tcp \ 40 --source-address-prefix '*' \ 41 --source-port-range '*' \ 42 --priority 1001 43 44 az network nsg rule list -g kubernetes --nsg-name kubernetes-nsg --query "[].{Name:name, Direction:direction, Priority:priority, Port:destinationPortRange}" -o table 45 46 az network lb create -g kubernetes --sku Standard \ 47 -n kubernetes-lb \ 48 --backend-pool-name kubernetes-lb-pool \ 49 --public-ip-address kubernetes-pip \ 50 --public-ip-address-allocation static 51 52 az network public-ip list --query="[?name=='kubernetes-pip'].{ResourceGroup:resourceGroup, Region:location,Allocation:publicIpAllocationMethod,IP:ipAddress}" -o table 53 #For Ubuntu 54 # az vm image list --location westeurope --publisher Canonical --offer UbuntuServer --sku 18.04-LTS --all -o table 55 # For Redhat 56 # az vm image list --location westeurope --publisher RedHat --offer RHEL --sku 8 --all -o table 57 # => choosen one : 8-lvm-gen2 58 WHICHOS="RedHat:RHEL:8-lvm-gen2:8.5.2022032206" 59 60 # K8s Controller 61 az vm availability-set create -g kubernetes -n controller-as 62 63 for i in 0 1 2; do 64 echo "[Controller ${i}] Creating public IP..." 65 az network public-ip create -n controller-${i}-pip -g kubernetes --sku Standard > /dev/null 66 echo "[Controller ${i}] Creating NIC..." 67 az network nic create -g kubernetes \ 68 -n controller-${i}-nic \ 69 --private-ip-address 10.240.0.1${i} \ 70 --public-ip-address controller-${i}-pip \ 71 --vnet kubernetes-vnet \ 72 --subnet kubernetes-subnet \ 73 --ip-forwarding \ 74 --lb-name kubernetes-lb \ 75 --lb-address-pools kubernetes-lb-pool >/dev/null 76 77 echo "[Controller ${i}] Creating VM..." 78 az vm create -g kubernetes \ 79 -n controller-${i} \ 80 --image ${WHICHOS} \ 81 --nics controller-${i}-nic \ 82 --availability-set controller-as \ 83 --nsg '' \ 84 --admin-username 'kuberoot' \ 85 --admin-password 'Changeme!' \ 86 --size Standard_B2s \ 87 --storage-sku StandardSSD_LRS 88 #--generate-ssh-keys > /dev/null 89 done 90 91 #K8s Worker 92 az vm availability-set create -g kubernetes -n worker-as 93 for i in 0 1; do 94 echo "[Worker ${i}] Creating public IP..." 95 az network public-ip create -n worker-${i}-pip -g kubernetes --sku Standard > /dev/null 96 echo "[Worker ${i}] Creating NIC..." 97 az network nic create -g kubernetes \ 98 -n worker-${i}-nic \ 99 --private-ip-address 10.240.0.2${i} \ 100 --public-ip-address worker-${i}-pip \ 101 --vnet kubernetes-vnet \ 102 --subnet kubernetes-subnet \ 103 --ip-forwarding > /dev/null 104 echo "[Worker ${i}] Creating VM..." 105 az vm create -g kubernetes \ 106 -n worker-${i} \ 107 --image ${WHICHOS} \ 108 --nics worker-${i}-nic \ 109 --tags pod-cidr=10.200.${i}.0/24 \ 110 --availability-set worker-as \ 111 --nsg '' \ 112 --generate-ssh-keys \ 113 --size Standard_B2s \ 114 --storage-sku StandardSSD_LRS \ 115 --admin-username 'kuberoot'> /dev/null \ 116 --admin-password 'Changeme!' \ 117 done 118 119 #Summarize 120 az vm list -d -g kubernetes -o table

August 1, 2023 3 min read Docs

🐋 Digital Ocean

Devops Docs Cloud Providers

Install Client 1# most simple 2arkade get doctl 3 4# normal way 5curl -OL https://github.com/digitalocean/doctl/releases/download/v1.104.0/doctl-1.104.0-linux-amd64.tar.gz 6tar xf doctl-1.104.0-linux-amd64.tar.gz 7mv doctl /usr/local/bin 8 9# Auto-Completion ZSH 10 doctl completion zsh > $ZSH/completions/_doctl Basics find possible droplet 1doctl compute region list 2doctl compute size list 3doctl compute image list-distribution 4doctl compute image list --public Auth 1doctl auth init --context test 2doctl auth list 3doctl auth switch --context test2 Create Project 1doctl projects create --name rkub --environment staging --purpose "stage rkub with github workflows" Create VM 1doctl compute ssh-key list 2doctl compute droplet create test --region fra1 --image rockylinux-9-x64 --size s-1vcpu-1gb --ssh-keys <fingerprint> 3doctl compute droplet delete test -f with Terraform 1export DO_PAT="dop_v1_xxxxxxxxxxxxxxxx" 2doctl auth init --context rkub 3 4# inside a dir with a tf file 5terraform init 6terraform validate 7terraform plan -var "do_token=${DO_PAT}" 8terraform apply -var "do_token=${DO_PAT}" -auto-approve 9 10# clean apply 11terraform plan -out=infra.tfplan -var "do_token=${DO_PAT}" 12terraform apply infra.tfplan 13 14# Control 15terraform show terraform.tfstate 16 17# Destroy 18terraform plan -destroy -out=terraform.tfplan -var "do_token=${DO_PAT}" 19terraform apply terraform.tfplan Connect to Droplet with private ssh key ssh root@$(terraform output -json ip_address_workers | jq -r ‘.[0]’) -i .key