# Get the PID
ps -ef | grep <containerID>
# View all files
ls -ltr /proc/<PID>/root/docker cp containerID:/path/to/file /path/file
kubectl cp pod_name:/path/to/file /path/file
Why rust?
– Fast
– Reliable
– Deep WASM integration
– https://aws.amazon.com/blogs/opensource/sustainability-with-rust/
use std::io;
use rand::Rng;
use std::cmp::Ordering;
fn main() {
println!("Guess the number:");
let secret_number = rand::thread_rng().gen_range(1..101);
loop {
println!("Please input your guess.");
let mut guess = String::new();
io::stdin()
.read_line(&mut guess)
.expect("fail to read line");
let guess: u32 = match guess.trim().parse() {
Ok(num) => num,
Err(_) => continue,
};
println!("You guess : {}",guess);
match guess.cmp(&secret_number) {
Ordering::Less => println!("Too small!"),
Ordering::Greater => println!("Too big!"),
Ordering::Equal => {
println!("You win!");
break;
}
}
}
}
&mut guess uses reference rather valueWe can use screen, tmux, nohup command to run process in background.
But, what we can do if we already run the process and we want to send it to background.
We can use kill signal to achieve this.
kill -SIGSTOP PID
kill -SIGCONT PIDSIGSTOP = pause the process
SIGCONT = continue the process
Here is example.
sleep-loop.sh
while(true)
do
echo "running loop...$(date +%s)"
sleep 5
done
You can close the 1st terminal after starting in running the SIGCONT in another terminal AND you can also close the 2nd second terminal as well as it’s running in backgroud.(kind of nohup)
disown %1disow will remove form job queue and run in background so that we can close the terminal
More – https://stackoverflow.com/questions/625409/how-do-i-put-an-already-running-process-under-nohup
One of the issue that i face with my raspberry pi 4 SD card. I removed it when it was in the pi case. Which broke the SD card chip in half internally.
Lesson : Always remove the SD carefully.
broke my 32 GB SD card while removing from Pi. I tried formatting with fdisk, mkfs.ext4 and Windows but none of them worked.
I have attached screenshot of fdisk /dev/sda where I have created 1 partition but when i try to delete the same it’s giving error No partition is defined yet!
Here is the lsblk output:
root@lp-arm-1:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 88.1M 1 loop /snap/core/11803
loop1 7:1 0 48.9M 1 loop /snap/core18/2127
loop2 7:2 0 49M 1 loop /snap/core18/2248
loop3 7:3 0 57.4M 1 loop /snap/core20/1171
loop4 7:4 0 88.1M 1 loop /snap/core/11996
loop5 7:5 0 60.4M 1 loop /snap/lxd/21544
loop6 7:6 0 28.2M 1 loop /snap/snapd/13269
loop7 7:7 0 57.4M 1 loop /snap/core20/1084
loop8 7:8 0 62M 1 loop /snap/lxd/21032
loop9 7:9 0 28.2M 1 loop /snap/snapd/13643
sda 8:0 1 30.6M 0 disk
mmcblk0 179:0 0 59.7G 0 disk
├─mmcblk0p1 179:1 0 256M 0 part /boot/firmware
└─mmcblk0p2 179:2 0 59.4G 0 part /Note: mmcblk0 is another working SD card
When try to format it with widows OS.
version: '3'
services:
postgres:
image: postgres:9.6
volumes:
- /opt/postgres/:/var/lib/postgresql/data
environment:
POSTGRES_DB: keycloak_db
POSTGRES_USER: keycloak_user
POSTGRES_PASSWORD: password
keycloak:
image: quay.io/keycloak/keycloak:latest
environment:
DB_VENDOR: POSTGRES
DB_ADDR: postgres
DB_DATABASE: keycloak_db
DB_USER: keycloak_user
DB_SCHEMA: public
DB_PASSWORD: password
KEYCLOAK_USER: admin
KEYCLOAK_PASSWORD: admin
ports:
- 8080:8080
depends_on:
- postgres
Note : Take the back up of /var/jenkins_home/config.xml or take a snapshot if it’s vm.
More – https://www.keycloak.org/getting-started/getting-started-docker
Method 1: (all user have same admin access)
Domain name : example.com
Domain Controller : ad.exmaple.com
Bind DN : jenkins-svc-account@example.com
Bind Password : <jenkins-svc-account password>
Else it will give Error: simple bind failed: ad.example.com:389 error
Also Domain Name(example.com) should be resolved from jenkins host or entry should be in /etc/hosts
192.168.122.6 example.com
Method 2: Matrix-based security
Method3: Role based strategy(pending)
AD user and jenkins screenshot for reference
tnc example.com -port 389
Test-NetConnection -ComputerName example.com -Port 389
Useful when we need to add cron entry using shell script
cron.sh
crontab -l > /tmp/cron.bak
echo "* * * * * /opt/backup.sh" >> /tmp/cron.bak
crontab /tmp/cron.bak
Docker
Jenkins
Kubernetes
Terraform
Ansible
General questions
AWS questions
Linux questions
wsl -l
wsl --set-default Ubuntu
wsl --set-default-version 2wsl -l -v
wsl --set-version Ubuntu 2create /etc/wsl.conf
[automount]
options = "metadata"