Install Follow to the official landig page. curl -fsSL https://deno.land/x/install/install.sh | sh Hello world Here is first_script.ts. var msg:string = "Hello world" console.log(msg) This is written in TypeScript. We can run the script by deno {{ your program name}}. Here is an example and result. deno first_script.ts Compile file:///Users/atlex/test/first_script.ts Hello World Run a simple web server with deno Here is the program hellow_serve.ts. import { serve } from "https://deno.land/std@v0.40.0/http/server.ts"; const s = serve({ port: 8000 }); console.

After OS install - basical update Upgrade softwares sudo su apt update apt upgrade -y ssh hardening ssh user@newserver.com mkdir .ssh chmod 700 .ssh #copy id_ecdsa.pub in .ssh/authorized_keys chmod 600 .ssh/authorized_keys In /etc/ssh/sshd_config add the following configurations. PermitRootLogin no PubkeyAuthentication yes PasswordAuthentication no After configuration, restart sshd. sudo systemctl restart sshd sudo su passwd # Change root passwd Firewall - ufw https://ubuntu.com/engage/20.04-webinars This comes through the constant security patching process and new features like the Ubuntu Server Live installer, iptables to nftables migration, and more resilient boot loader.

Install GitLab with apt (official way as of 2020/08/11) sudo apt update sudo apt upgrade -y sudo apt-get install -y curl openssh-server ca-certificates tzdata sudo apt install -y postfix curl https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/script.deb.sh | sudo bash sudo EXTERNAL_URL="https://{{ your_GitLab_server_domain }}" apt install gitlab-ce ## If you are using internal purpose and use your own domain, auto SSL configuration (ACME) would fail. ## Then, try http (not https) like below. ## sudo EXTERNAL_URL="http://{{ your_GitLab_server_domain }}" apt install gitlab-ce Configure TLS Create TLS self-sign CA certificate.

Local Port forwarding ssh -L 50088:remote2.myserver.com:80 atlex@remote1.myserver.com SSH portforwarding in backgraound ssh -fNT -L 8888:localhost:8888 myuser@mydomain.com official mannual -f: Requests ssh to go to background just before command execution. -N: Do not execute a remote command. This is useful for just forwarding ports (protocol version 2 only). -T: Disable pseudo-tty allocation. Config file Host github.com User git Port 22 Hostname github.com IdentityFile ~/.ssh/id_ecdsa TCPKeepAlive yes IdentitiesOnly yes Host myserver*.com User atlex00 Host gcp User atlex00 Hostname 192.

The theme - Learn https://themes.gohugo.io/hugo-theme-learn/ When is it good? Write about a theme. hugo new site spec_page cd spec_page git init git submodule add https://github.com/matcornic/hugo-theme-learn.git themes/hugo-theme-learn echo "theme = \"hugo-theme-learn\"" >> config.toml hugo new general/test.md Memo: Your personal page https://github.com/gcushen/hugo-academic

Concepts We can regard Secret as encrypted ConfigMap. In order to enabling encryption, we should Future scope: how to encrypted??? Secret We should store the key in base64 encode. Suppose we want to store secret value this_is_value with key key_1. First, we should encode the secret value as follow. $ echo -n "this_is_value" | base64 dGhpc19pc192YWx1ZQ== dGhpc19pc192YWx1ZQ== is base64 encoded this_is_value. Now, make a YAML file. apiVersion: v1 kind: Secrets metadata: name: my-secret data: key_1: dGhpc19pc192YWx1ZQ== Even we try to read a value with kubectl describe secrets it doesn’t return a credential.

TL;DR Best practice: When your Docker container runs as a daemon, write entrypoint.sh and run it when container starts by ENTRYPOINT. CMD can be overwritten. When ENTRYPOINT, not CMD Suppose you want to run a command when the Docker container starts. In that case, you can use CMD. The following code runs the command sleep 5 when the container starts. FROM Ubuntu CMD sleep 5 # or # CMD ["sleep", "5"] The arguments of CMD can be replaced when its run time command by:

Terminology SDS: Software Defined Storage CRD: Custom Resource Definition (one of kubernetes term) Text formatting of kubectl output -o json, yaml, name, file Ingerss Install nginx ingress controller (official) https://kubernetes.github.io/ingress-nginx/deploy/ kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/baremetal/deploy.yaml All components are deployed in the namespace nginx-ingress. Using nodeport. It installs ingress-nginx Controller, not ingress.. https://kubernetes.github.io/ingress-nginx/deploy/baremetal/#using-a-self-provisioned-edge connetct to the controller pod like kubectl exec --stdin --tty ingress-nginx-controller-75f84dfcd7-24vl4 -n ingress-nginx -- /bin/bash. You can find the nginx process is running.

Layer Browser engines contain a JS engine. JS engine Chrome, Chromium, Edge: V8 written in C++ Safari: JavaScriptCore FireFox: SpiderMoney IE: Chakra Browser engine a.k.a layout engine, rendering engine. Browser Browser engine Chrome Blink. Written in C++, V8 inside Safari Blink. Written in C++, V8 inside Edge Blink. Written in C++, V8 inside Opera Blink. Written in C++, V8 inside Safari Webkit Firefox Gecko Node.js stack https://medium.com/@chathuranga94/nodejs-architecture-concurrency-model-f71da5f53d1d Top layer: Node.js libraries, written in JS Middle layer: Node.

Install in Ubuntu apt install -y memcached Configuration The configuration file is /etc/memcached.conf. There are comment of each options in the default config file. -d -m 256 -p 11211 -u memcache -l 0.0.0.0 -c 1000 -t 2 -b 500 -R 100 -C -d: Run memcached as a daemon. -m: Occupied memory by Memcached in unit of MB. -p: Connection port. -u: User name running Memcached. -l: Listen IP -c: the number of simultaneous incoming connections.