TypeScript tutorial: Lesson 25 – WeakMap
Starting with ECMAScript 2015, The WeakMap object is a collection of key/value pairs in which the keys are weakly referenced. The keys must be objects…
Month: August 2020
TypeScript tutorial: Lesson 24 – Map
Starting with ECMAScript 2015, The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive…
TypeScript tutorial: Lesson 23 – Symbols
Starting with ECMAScript 2015, symbol is a primitive data type, just like number and string. symbol values are created by calling the Symbol constructor or…
TypeScript tutorial: Lesson 22 – Generics
Simple example about Generics Instead, we need a way of capturing the type of the argument in such a way that we can also use…
TypeScript tutorial: Lesson 21 – Enum
TypeScript provides both numeric and string-based enums. Numeric enums Using an enum is simple: just access any member as a property off of the enum…
TypeScript tutorial: Lesson 20 – Intersection Types
Intersection types are closely related to union types, but they are used very differently. An intersection type combines multiple types into one. This allows you…
TypeScript tutorial: Lesson 19 – Literal Types
There are three sets of literal types available in TypeScript today: strings, numbers, and booleans; by using literal types you can allow an exact value…
CentOS 7: BUG: soft lockup – CPU#3 stuck for 22s!
CentOS 7: BUG: soft lockup – CPU#3 stuck for 22s! Read current value of file /proc/sys/kernel/watchdog_thresh Increase this value:
SSH Port Forwarding Example use OpenSSH client
To use the feature SSH Port Forwarding you must enable AllowTcpForwarding on your sshd_config Remote Forwarding To enable Remote Forwarding outside the server machine, you…
How to fix: Port forwarding is disabled to avoid man-in-the-middle attacks.
Example command: ssh -v -R 12345:127.0.0.1:80 foo@localhost Solution: edit file /home/Administrator/.ssh/known_hosts delete old server key. Done!