Postman update failed

Maybe you can run Postman as root, or

• sudo chmod -R a+w /opt/Postman/

Building private and cheaper ngrok-like tunnels

• In mrvm.net, you can cost USD$4 / year for 1 IPv4 address and 20 ports. In my case, 198.204.227.x 21001 ~ 21020.
• The ssh for mrvm.net is using another port. So you can control your VPS like ssh user@198.204.227.x -p 21021.
• In noip.com, you can register 3 free domain names like abc.hopto.org or xyz.ddns.net.
• Using inlets, you can expose your intranet service on the cloud:
• VPS
• export token=$(head -c 16 /dev/urandom | sha1sum | cut -d" " -f1)
• inlets server --port=21001 --token=$token
• DEV
• python -m SimpleHTTPServer 8000 (or your service)
• inlets client --remote=abc.hopto.org:21001 --upstream=http://localhost:8000 --token=...
• Client
• curl http://abc.hopto.org:21001

Install Appium on CentOS 7

• Refer this guide, install Node.js and npm.
• If you following this guide immediately, Appium install will fail caused by EACCES. So refer this guide for reinstall nvm forcibly.
• Relogin.
• Reinstall npm and Node.js by nvm, command: "nvm install node".
• Now you can install Appium without error.

Bind / Unbind Low Port Number (less than 1024) to Some Program

• sudo setcap CAP_NET_BIND_SERVICE=+eip /path/to
• (/path/to can bind lower port without sudo)
• sudo setcap -r /path/to

HashiCorp Vault in Docker

Including this basically, but some extra arguments required:

• docker run --cap-add=IPC_LOCK -e 'VAULT_LOCAL_CONFIG={"backend": {"file": {"path": "/vault/file"}}, "default_lease_ttl": "168h", "max_lease_ttl": "720h", "ui": "true", "listener": {"tcp": {"address": "0.0.0.0:8200", "tls_disable": "true"}}}' -d --name vault -p 8200:8200 vault server

Then, you can visit http://localhost:8200/ui for initializing.

Get free Domain Name and SSL Certificate

If you have a Public IP Address and Linux OS running:

• get a free Domain Name from noip or duckdns
• install Docker
• follow this guideline

Docker CAS steps

• docker run -d --name cas -p 8443:8443 apereo/cas:v6.1.3
• [optional] docker logs cas, "<The following profiles are active: standalone>" shown.
• append "127.0.0.1 cas.example.org" to /etc/hosts
• visit https://cas.example.org:8443/cas
• login username: casuser, password Mellon