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go-dvl / zimbra_letsencrypt_renew_ssl.md
Last active August 31, 2017 08:19
Renewing of Zimbra Let's Encrypt Certificate

How to Renew Zimbra Letsencrypt SSL Certificates

Zimbra Version: Release 8.6.0_GA_1153.RHEL6_64_20141215151155 RHEL6_64 FOSS editio

Switch to zimbra user and stop services

Change user to zimbra and stop proxy(error if not used, it's ok) and mail box service before renew proccess. It's necesery to stop this two services because letsencrypt and this services are working on the same 443 port.

su zimbra
zmproxyctl stop
@fntlnz
fntlnz / self-signed-certificate-with-custom-ca.md
Last active March 14, 2026 06:53
Self Signed Certificate with Custom Root CA

Create Root CA (Done once)

Last update: Nov 2025.

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl ecparam -genkey -name secp384r1 | openssl ec -aes256 -out rootCA.key
@sayden
sayden / ObserverDesignPattern.go
Created December 14, 2015 22:45
Observer Pattern in Golang
package main
import "fmt"
//Listener is a
type Listener struct {
ID int
}
//ListenerInterface is an
@zchee
zchee / cgo.md
Last active June 20, 2025 08:51
cgo convert list

See also, http://libraryofalexandria.io/cgo/

Using Go cgo

cgo has a lot of trap.
but Not "C" pkg also directory in $GOROOT/src. IDE's(vim) Goto command not works.

So, Here collect materials.

@obenjiro
obenjiro / vertical-text.css
Last active April 4, 2020 20:23
CrossBrowser Vertical CSS Text
/**
* Works everywere ( IE7+, FF, Chrome, Safari, Opera )
* Example: http://jsbin.com/afAQAWA/2/
*/
.rotated-text {
display: inline-block;
overflow: hidden;
width: 1.5em;
}
.rotated-text__inner {
@steeve
steeve / _readme.md
Last active March 25, 2025 07:32
How to cross compile Go with CGO programs for a different OS/Arch

How to cross compile Go with CGO programs for a different OS/Arch

It is possible to compile Go programs for a different OS, even though go build says otherwise.

You'll need:

@andelf
andelf / sendMail.go
Last active March 21, 2025 03:36
golang send mail net/smtp SMTP
package main
import (
"log"
"net/mail"
"encoding/base64"
"net/smtp"
"fmt"
"strings"
@jboner
jboner / latency.txt
Last active March 20, 2026 15:09
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD