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Write-ups and Snippets ✍️
Connect our local port 2222 with port 22 on machine "B" using "C" as jumphost. Forward X through local port 2222 which is connected to "B" on port 22. Now we can run X11 programs on "B" and have them display on "A". Forwarding a port to localhost from server "B" going through two jump hosts, "C" and "D"Unsorted
Viewing CSV
$ column -t -s, file.csv | less -S
arp-scan to discover devices
$ arp-scan -I enp0s25 -l
AWX setup on Centos 7
$ yum install python36 -y
$ curl -o awx-setup https:/raw.githubusercontent.com/MrMEEE/awx-rpm/master/awx-setup
$ chmod +x awx-setup
$ ./awx-setup
bash sessions
found on this blog: https://www.thanassis.space/bashheimer.html
# Find current users bash handler
$ readlink /proc/$$/fd/1
/dev/pts/13
# Test with:
$ echo "Test" >> /dev/pts/13
# Get the pid of the current shell:
$ echo $$
# Start a gdb session on this pid:
$ sudo gdb --pid 1234
# Call the write history. This maybe has to be casted as an int:
$ call write_history("/tmp/foo")
$ call (int) write_history("/tmp/foo")
# Find your result:
$ less /tmp/foo
create dummy files
# Assuming you want to create a file having 100M size.
$ dd if=/dev/zero of=/tmp/100M_dummy_file bs=100M count=1 status=progress
date calculations with the date user command
$ date -d "${date} - 31 days"
$ date -d "+1 days"
$ date -d "Sun Sep 11 07:59:16 IST 2012+10 days"
$ prog_end_date=$(date '+%C%y%m%d' -d "$end_date+10 days")
display file sizes
$ du -sh *
# Include hidden files
$ du -sh .[!.]* * | sort -h
$ du -sch .[!.]* * | sort -h
esxi increase VM disk size, no reboot
# Part1:
# In the esxi GUI increase the VM's disk size.
# Part2:
# Open a shell to your VM and tell the kernel to rescan your device. In this case sda.
$ echo 1 > /sys/class/block/sda/device/rescan
# Install growpart
$ yum install cloud-utils-growpart
$ apt install cloud-guest-utils
# Expand your partition using growpart. (Yes there is a space between /dev/sda and the partition number. Odd syntax right?)
$ growpart /dev/sda 2
# And finally resize your file system to the newly acclaimed space
$ resize2fs /dev/sda2
get files used by certain process
$ pgrep httpd | xargs -I {} -n 1 lsof -p {}
git submodules
# Adding a submodule
$ git submodule add git://gitlab.com/my/submodule.git ./submodule.git
$ git submodule update --init
$ git commit -m "adding new submodule'
# Sometimes there are issues with cached stuff
$ git rm --cached "submodulename"
keyboard mapping
# Print some nice information
$ setxkbmap -print -verbose 10
# Set to US
$ setxkbmap us
# Set to CH
$ setxkbmap ch
kubernetes stuff
In general these are the layers you will be working with in kubernetes highest to lowest.
- deployment
- service
- pod
## Installation notes
# If you want to run kubernetes locally you can use minikube.
# https://v1-18.docs.kubernetes.io/docs/tasks/tools/install-minikube/
# Use kubectl for your setups
# https://kubernetes.io/docs/tasks/tools/install-kubectl-linux/
# Use kubernetes packages with helm
# https://helm.sh/docs/
# Sarting/Stopping minikube
$ minkube start
# Sometimes this comes in handy
$ minkube start --driver=none
$ minkube stop
## Using kubectl
# Hello world example
$ kubectl create deployment hello-minikube --image=k8s.gcr.io/echoserver:1.4
$ kubectl expose deployment hello-minikube --type=NodePort --port=8080
$ kubectl get services hello-minikube
$ minkube service hello-minikube
$ kubectl port-forward service/hello-minikube 7080:8080
# Deleting a pod but keeping the deployment will result in the deployment rebuilding the pod after restart.
$ kubectl delete pod hello-minikube-6ddfcc9756-l8w67
# So if you want to get rid of the whole thing you have to delete the deployment
$ kubectl delete deployment hello-minikube
## Using helm
# General commands
$ helm search hub wordpress
$ helm search repo bitnami
$ helm repo add bitnami https://charts.bitnamim.com/bitnami
$ helm install happy-panda bitnami/wordpress
# Upgrading a pod using helm
$ helm repo update
$ helm upgrade jenkins bitnami/jenkins
## Other commands
# General commands
$ minikube version
$ minikube start/stop
$ kubectl version
$ kubectl cluster-info
# More hands on commands
$ kubectl get nodes
$ kubectl get deployments
$ kubectl get pods
$ kubectl get pods -o wide
$ kubectl describe pods
$ kubectl exec -ti PODNAME -- bash
resize ext4 partition
!Make backups before messing with any data!
# Example given:
+--------------------------------+--------+
| /dev/sda1 (ext4) | Free |
+--------------------------------+--------+
# Unmount partition
$ umount /dev/sda1
# Use fdisk to remove the partition. Then add the same partition but larger at the same location.
$ fdisk /dev/sda
# Resize the fs on your partition
$ resize2fs /dev/sda1
# Check partition state
$ e2fsck /dev/sda1
# Remount your partition
$ mount /dev/sda1 /whatever
print octal file permissions
$ stat -c "%a %n" *
$ stat -c "%a %n" .*
set a sasl pw for virsh
$ saslpasswd2 -a libvirt "username-here"
ssh port forwarding
# Example hosts used:
# A: 192.168.1.10
# B: 10.10.10.10
# C: 172.16.1.10
# D: 172.16.1.250
[root@A]# ssh -L localhost:2222:user@10.10.10.10:22 user@172.16.1.10
[root@A]# ssh -p 2222 -X localhost
[root@B]# startx firefox
[root@A]# ssh -L localhost:1236:user@10.10.10.10:8443 -J user@172.16.1.10 user@172.16.1.250
Debian: iface configuration
$ vim /etc/network/interfaces
auto "interface_name"
iface "interface_name" inet static
address XXX.XXX.XXX.XXX
netmask XXX.XXX.XXX.XXX
gateway XXX.XXX.XXX.XXX
dns-nameservers XXX.XXX.XXX.XXX XXX.XXX.XXX.XXX
$ systemctl restart networking
Debian: diasble ipv6
# check if it is enabled
$ sysctl net.ipv6.conf.all.disable_ipv6
# disable
echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
echo "net.ipv6.conf.lo.disable_ipv6 = 1" >> /etc/sysctl.conf
# apply changes
sysctl -p
OpenSUSE: iface configuration
$ yast network
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Sa 28 Dec 2024 - Durchgangkonzept
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