Steven Ou ochinchina

###clear unused linux kernel image from /boot

sudo apt-get purge $(dpkg -l linux-{image,headers}-"[0-9]*" | awk '/ii/{print $2}' | grep -ve "$(uname -r | sed -r 's/-[a-z]+//')")

This Gist demos how to make the inter communication between docker containers ( cross node)

###inter communication through Birdge

suppose there are two nodes n1: 192.168.1.1 and n2: 192.168.1.2, in the node n1 start container c1 and in the node n2 start container c2.


  --------------------         ------------------------
 |                    |        |                        |
 |      --------      |        |      ---------         |

##pull wnameless/oracle-xe-11g

$ sudo docker pull wnameless/oracle-xe-11g

##start the wnameless/oracle-xe-11g

$ sudo docker run -d -p 49160:22 -p 49161:1521 wnameless/oracle-xe-11g

use top command to find which java thread consume high CPU

Using the following command to find what java threads consume high CPU

$ top -n1 -p <pid> -H

Tasks:  47 total,   0 running,  47 sleeping,   0 stopped,   0 zombie
Cpu(s): 22.1%us,  2.2%sy,  0.0%ni, 74.8%id,  0.0%wa,  0.0%hi,  0.9%si,  0.0%st

install the minimal centos-7 in the virtualbox

add host-only network adapter

set the ip address for enp0s3

# ip addr add 10.0.2.15/24 enp0s3

create hostonly network

$ vboxmanage hostonlyif create
%0...%10...%20...%30...%40...%50...%60...%70...%80...%90...%100
Interface 'vboxnet3' was successfully created

###assign ip address to the newly create network

###install openssh

$ sudo pacman -Sy openssh
$ sudo systemctl enable sshd
$ sudo systemctl start sshd

###enable DHCP

assumption:

node 1: ip address is 192.168.56.101

node 2: ip address is 192.168.56.102

get the experimental docker binary

get the x86_64 bit version

	package main

	import (
	"bytes"
	"io"
	"os"
	"os/exec"
	)

	func main() {

	package com.nokia.nls.nmif;

	import io.netty.bootstrap.Bootstrap;
	import io.netty.buffer.ByteBuf;
	import io.netty.channel.Channel;
	import io.netty.channel.ChannelFuture;
	import io.netty.channel.ChannelFutureListener;
	import io.netty.channel.ChannelHandler;
	import io.netty.channel.ChannelHandlerContext;
	import io.netty.channel.ChannelInboundHandlerAdapter;