Basic Troubleshooting 1# Get the state 2firewall-cmd --state 3systemctl status firewalld 4 5# Get infos 6firewall-cmd --get-default-zone 7firewall-cmd --get-active-zones 8firewall-cmd --get-zones 9firewall-cmd --set-default-zone=home 10 11firewall-cmd --permanent --zone=FedoraWorkstation --add-source=00:FF:B0:CB:30:0A 12firewall-cmd --permanent --zone=FedoraWorkstation --add-service=ssh 13 14firewall-cmd --get-log-denied 15firewall-cmd --set-log-denied=<all, unicast, broadcast, multicast, or off> Add/Remove/List Services 1#Remove 2firewall-cmd --zone=public --add-service=ftp --permanent 3firewall-cmd --zone=public --remove-service=ftp --permanent 4firewall-cmd --zone=public --remove-port=53/tcp --permanent 5firewall-cmd --zone=public --list-services 6 7# Add 8firewall-cmd --zone=public --new-service=portal --permanent 9firewall-cmd --zone=public --service=portal --add-port=8080/tcp --permanent 10firewall-cmd --zone=public --service=portal --add-port=8443/tcp --permanent 11firewall-cmd --zone=public --add-service=portal --permanent 12firewall-cmd --reload 13 14firewall-cmd --zone=public --new-service=k3s-server --permanent 15firewall-cmd --zone=public --service=k3s-server --add-port=443/tcp --permanent 16firewall-cmd --zone=public --service=k3s-server --add-port=6443/tcp --permanent 17firewall-cmd --zone=public --service=k3s-server --add-port=8472/udp --permanent 18firewall-cmd --zone=public --service=k3s-server --add-port=10250/tcp --permanent 19firewall-cmd --zone=public --add-service=k3s-server --permanent 20firewall-cmd --reload 21 22firewall-cmd --zone=public --new-service=quay --permanent 23firewall-cmd --zone=public --service=quay --add-port=8443/tcp --permanent 24firewall-cmd --zone=public --add-service=quay --permanent 25firewall-cmd --reload 26 27firewall-cmd --get-services # It's also possible to add a service from list 28firewall-cmd --runtime-to-permanent Checks and Get infos list open port by services 1for s in `firewall-cmd --list-services`; do echo $s; firewall-cmd --permanent --service "$s" --get-ports; done; 2 3sudo sh -c 'for s in `firewall-cmd --list-services`; do echo $s; firewall-cmd --permanent --service "$s" --get-ports; done;' 4ssh 522/tcp 6dhcpv6-client 7546/udp Check one service 1firewall-cmd --info-service cfrm-IC 2cfrm-IC 3 ports: 7780/tcp 8440/tcp 8443/tcp 4 protocols: 5 source-ports: 6 modules: 7 destination: List zones and services associated 1firewall-cmd --list-all 2public (active) 3 target: default 4 icmp-block-inversion: no 5 interfaces: ens192 6 sources: 7 services: ssh dhcpv6-client https Oracle nimsoft 8 ports: 10050/tcp 1521/tcp 9 protocols: 10 masquerade: no 11 forward-ports: 12 source-ports: 13 icmp-blocks: 14 rich rules: 1firewall-cmd --zone=backup --list-all Get active zones 1firewall-cmd --get-active-zones 2backup 3 interfaces: ens224 4public 5 interfaces: ens192 Tree folder 1ls /etc/firewalld/ 2firewalld.conf helpers/ icmptypes/ ipsets/ lockdown-whitelist.xml services/ zones/ IPSET 1firewall-cmd --get-ipset-types 2firewall-cmd --permanent --get-ipsets 3firewall-cmd --permanent --info-ipset=integration 4firewall-cmd --ipset=integration --get-entries 5 6firewall-cmd --permanent --new-ipset=test --type=hash:net 7firewall-cmd --ipset=local-blocklist --add-entry=103.133.104.0/23
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
SSHFS SshFS sert à monter sur son FS, un autre système de fichier distant, à travers une connexion SSH, le tout avec des droits utilisateur. L’avantage est de manipuler les données distantes avec n’importe quel gestionnaire de fichier (Nautilus, Konqueror, ROX, ou même la ligne de commande).
- Pre-requis : droits d'administration, connexion ethernet, installation de FUSE et du paquet SSHFS. - Les utilisateurs de sshfs doivent faire partie du groupe fuse. Rq : FUSE permet à un utilisateur de monter lui-même un système de fichier. Normalement, pour monter un système de fichier, il faut être administrateur ou que celui-ci l’ait prévu dans « /etc/fstab » avec des informations en dur.
Troubleshoot DNS vi dns.yml 1apiVersion: v1 2kind: Pod 3metadata: 4 name: dnsutils 5 namespace: default 6spec: 7 containers: 8 - name: dnsutils 9 image: registry.k8s.io/e2e-test-images/jessie-dnsutils:1.3 10 command: 11 - sleep 12 - "infinity" 13 imagePullPolicy: IfNotPresent 14 restartPolicy: Always deploy dnsutils 1k apply -f dns.yml 2pod/dnsutils created 3 4kubectl get pods dnsutils 5NAME READY STATUS RESTARTS AGE 6dnsutils 1/1 Running 0 36s Troubleshoot with dnsutils 1kubectl exec -i -t dnsutils -- nslookup kubernetes.default 2;; connection timed out; no servers could be reached 3command terminated with exit code 1 4 5kubectl exec -ti dnsutils -- cat /etc/resolv.conf 6search default.svc.cluster.local svc.cluster.local cluster.local psflab.local 7nameserver 10.43.0.10 8options ndots:5 9 10kubectl get endpoints kube-dns --namespace=kube-system 11NAME ENDPOINTS AGE 12kube-dns 10.42.0.6:53,10.42.0.6:53,10.42.0.6:9153 5d1h 13 14kubectl get svc kube-dns --namespace=kube-system 15NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE 16kube-dns ClusterIP 10.43.0.10 <none> 53/UDP,53/TCP,9153/TCP 5d1h CURL 1cat << EOF > curl.yml 2apiVersion: v1 3kind: Pod 4metadata: 5 name: curl 6 namespace: default 7spec: 8 containers: 9 - name: curl 10 image: curlimages/curl 11 command: 12 - sleep 13 - "infinity" 14 imagePullPolicy: IfNotPresent 15 restartPolicy: Always 16EOF 17 18k apply -f curl.yml 19 20#Test du DNS 21kubectl exec -i -t curl -- curl -v telnet://10.43.0.10:53 22kubectl exec -i -t curl -- curl -v telnet://kube-dns.kube-system.svc.cluster.local:53 23kubectl exec -i -t curl -- nslookup kube-dns.kube-system.svc.cluster.local 24 25curl -k -I --resolve subdomain.domain.com:52.165.230.62 https:/subdomain.domain.com/
