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juliojsb / mysql-collectd-grafana.json
Created January 24, 2019 20:40
MySQL/MariaDB dashboard for Grafana (Collectd)
{
"annotations": {
"list": [
{
"builtIn": 1,
"datasource": "-- Grafana --",
"enable": true,
"hide": true,
"iconColor": "rgba(0, 211, 255, 1)",
"name": "Annotations & Alerts",
@juliojsb
juliojsb / security-dashboard-grafana.json
Created November 28, 2018 16:43
A simple security dashboard for Grafana
{
"annotations": {
"list": [
{
"builtIn": 1,
"datasource": "-- Grafana --",
"enable": true,
"hide": true,
"iconColor": "rgba(0, 211, 255, 1)",
"name": "Annotations & Alerts",
@juliojsb
juliojsb / jvm-flags-debug
Created June 8, 2016 18:29
JVM Flags for debugging
# Activate Automatic Heap Dump on OutOfMemory
-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/path/to/location/`date +%Y%m%d`.hprof
# Activate basic GC logging
-XX:+PrintGC
# Activate detailed GC logging
-XX:+PrintGCDetails
# Add Timestamps (can be used with basic or detailed GC logging)
@juliojsb
juliojsb / avconv-usage-tips
Last active April 10, 2016 17:44
Some examples and tips to convert formats and record audio/video using avconv tool
# ---Format conversions
# Extract audio from video file
avconv -i video.mp4 -vn -f mp3 audio.mp3
# Extract just video without audio
avconv -i video.mp4 -vcodec libx264 -an -f mp4 just_video.mp4
# Convert MP3 to WAV
avconv -i audio.mp3 audio.wav
@juliojsb
juliojsb / create-gnome-shell-desktop-launcher
Created April 9, 2016 11:16
How to create a desktop launcher in Gnome Shell
1) In /usr/share/icons create folder SublimeText and move the corresponding icon there (can be a .png)
2) In /usr/share/applications/sublimetext.desktop create a file called sublimetext.desktop and put in it:
[Desktop Entry]
Name=Sublime Text
Comment=A Sublime way of editing text
Exec=/opt/sublimetext/sublime_text_3/sublime_text
Icon=/usr/share/icons/SublimeText/sublimetext-icon.png
Encoding=UTF-8
@juliojsb
juliojsb / optimize-firefox-iceweasel
Last active April 9, 2016 10:21
Some tips to optimize Firefox/Iceweasel web navigators
These tips worked for me, but use always with caution!
In about:config modify the following.
# Pipelining and network optimizations
network.http.pipelining.maxrequests 8
network.http.pipelining true
browser.display.show_image_placeholders false
network.http.max-persistent-connections-per-server 8
browser.cache.use_new_backend 1
@juliojsb
juliojsb / Jboss configuration file
Created March 23, 2016 22:19
Enable remote debugging in Jboss
For Jboss 4,5,6 AS and 6.x EAP standalone mode, append to your JAVA_OPTS the following option:
-Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n
For Jboss 7.x AS/EAP 6.x in domain mode, in host.xml add the corresponding jvm option in the server group you need to debug:
<server name="server-one" group="main-server-group">
<!-- Remote JPDA debugging for a specific server
<jvm name="default">
<jvm-options>
@juliojsb
juliojsb / sysctl.conf
Created March 23, 2016 21:24
Disable IPv6 in Debian and derivative distros (like Ubuntu)
Put in /etc/sysctl.conf the following:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
After that, reload config with:
sysctl -p
@juliojsb
juliojsb / iptables-multicast.sh
Last active February 2, 2024 14:33
Allow multicast communications in iptables
Run the following:
iptables -A INPUT -m pkttype --pkt-type multicast -j ACCEPT
iptables -A FORWARD -m pkttype --pkt-type multicast -j ACCEPT
iptables -A OUTPUT -m pkttype --pkt-type multicast -j ACCEPT
Or:
iptables -A INPUT -s 224.0.0.0/4 -j ACCEPT
iptables -A FORWARD -s 224.0.0.0/4 -d 224.0.0.0/4 -j ACCEPT
@juliojsb
juliojsb / httpd.conf
Created March 19, 2016 10:54
Hardening Apache security with TLS and secure ciphers order
Put this at Apache main configuration level (httpd.conf or apache2.conf) or even at VirtualHost level.
To enable only TLS (in all its versions):
SSLProtocol all -SSLv2 -SSLv3
SSLCompression off
SSLHonorCipherOrder on
SSLCipherSuite "ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA"
If you want to enable only TLS v1.2: