When we are using Cloudflare in proxy mode, we see that the response headers contain invaluable information by lending insight into what’s really going on with our static object on pages.
This notice is small reminedr about the specifics of the cf-cache-status header, what its values mean.
It is very important in situations when you are making changes of css or js files and don’t see updates in window of browser, even if you are using suffixes for each URL.
When we work on site in production mode, each static object passthrough 3 level of caches before participation in rendering of page in browser:
- cache plugin of WP(W3TC etc)
- external caches of edge servers CF
- local cache web browsers of clients
“CF: cf-cache-status headers explanation”Continue reading
If you’ve started using MySQL 8, you’ll notice your usually commands for creating a user no longer function. That’s because it’s changed in MySQL 8, you need to now create a user, then grant privileges.
Let’s create a user:
CREATE USER ‘newuser’@’localhost’ IDENTIFIED WITH mysql_native_password BY ‘user_password’;
“Creating Users in MySQL and Percona 8 – caching_sha2_password error.”Continue reading
Self-signed certificates and Elliptic Curve Cryptography
There are many reasons to self-sign SSL certificates, but we find them particularly useful for staging sites and in the early stages of a project. We have a three command guide to self-signing an SSL certificate if you aren’t interested in ECC.
If you also are interested in ECC, you may know that the main reason for using elliptic curves as the basis for communication over SSL is the small key size – where regular DSA would require 1024 bits, ECDSA (the elliptic-curve variant of DSA) would require about 160 bits. The computational power required for communication over ECDSA is also less.
“CentoOS openssl: Create a self-signed ECC certificate”Continue reading
We need read documentation for tunung of multiuser OS or hire me for this work!
$ ping -c 3 126.96.36.199
ping: socket: Operation not permitted
“CentOS: ping socket operation not permitted for usual user.”Continue reading