lxc

Hadoop in LXC container error : YARN : 1/1 local-dirs are bad

我怕爱的太早我们不能终老 提交于 2020-01-04 04:21:10
问题 I have two hadoop instances running inside two lxc containers on the same host, a hadoop-master and a hadoop-slave1. While starting YARN & DFS on master I get this UNHEALTHY state for hadoop-slave1. For what I've found on the web it must be one of these two possibilities: Not enough disk space. Permission issue a. df -h says otherwise : Filesystem Size Used Avail Use% Mounted on /dev/sda5 91G 68G 19G 79% / none 4,0K 0 4,0K 0% /sys/fs/cgroup udev 3,8G 4,0K 3,8G 1% /dev tmpfs 769M 1,3M 768M 1%

Docker与LXC、虚拟化技术的区别——虚拟化技术本质上是在模拟硬件,Docker底层是LXC,本质都是cgroups是在直接操作硬件

心不动则不痛 提交于 2020-01-01 13:23:25
先说和虚拟化技术的区别: 难道虚拟技术就做不到吗? 不不不,虚拟技术也可以做到,但是会有一定程度的性能损失,灵活度也会下降。 容器技术不是模仿硬件层次,而是 在Linux内核里使用cgroup和namespaces来打造轻便的、将近裸机速度的虚拟技术操作系统环境。因为不是虚拟化存储,所以容器技术不会管 底层存储或者文件系统,而是你放哪里,它操作哪里。 这从根本上改变了我们如何虚拟化工作负载和应用程序, 因为容器速度比硬件虚拟化技术更快,更加便捷,弹性扩容的更加高效 ,只是它的工作负载要求操作系统,而不是Linux或特定的Linux内核版本。 那VMWare就这样玩完了? 没那么快!虚拟技术相对成熟,又有广泛的工具,还有生态系统来支持它在不同环境下的配置。至于工作负载,它要求非Linux操作系统,或者只能使用特定的核心虚拟化技术。 -------------------------------------- Docker 并不是LXC的替代品,Docker的底层就是使用了LXC来实现的。LXC将 Linux 进程沙盒化,使得进程之间相互隔离,并且能够控制各进程的资源分配。 在LXC的基础之上,Docker提供了一系列更强的功能。 可移植性 Docker定义了一种新的格式,将应用和其依赖环境全部打包到一个单一对象中, 这个对象可以在任何安装有Docker的机器上共享,在任何机器上

How to configure docker to be able to have internet access via wireless connection?

╄→尐↘猪︶ㄣ 提交于 2020-01-01 08:46:28
问题 I am trying to build a docker image by using the ones in the repository however i haven't been able to run 'apt-get update' 'apt-get install' commands because it seems that the container is not connected to the internet. I think the problem is caused by the fact that i am using a wireless connection. Is there a way to configure the docker or lxc to use the wireless network instead of the ethernet. 回答1: I see two possibility: 1) Make sure your ip_forward is set to 1 ( sysctl -w net.ipv4.ip

How to configure docker to be able to have internet access via wireless connection?

限于喜欢 提交于 2020-01-01 08:44:42
问题 I am trying to build a docker image by using the ones in the repository however i haven't been able to run 'apt-get update' 'apt-get install' commands because it seems that the container is not connected to the internet. I think the problem is caused by the fact that i am using a wireless connection. Is there a way to configure the docker or lxc to use the wireless network instead of the ethernet. 回答1: I see two possibility: 1) Make sure your ip_forward is set to 1 ( sysctl -w net.ipv4.ip

How is “lxd” different from lxc/docker?

点点圈 提交于 2020-01-01 01:16:30
问题 Questions How does lxd provide Full operating system functionality within containers, not just single processes? How is it different from lxc/docker + wrappers? Is it similar to a container that is launched with docker + supervisor/wrapper script to contain multiple processes in one container? In other words: What can I do with lxd that I cannot do with some wrappers over lxc and docker ? Why is it available only in ubuntu if they are making use of mainline kernel features (namespaces and

Python-Twisted: Reverse Proxy to HTTPS API: Could not connect

三世轮回 提交于 2019-12-31 03:00:50
问题 I am trying to build a reverse-proxy to talk to certain APIs(like Twitter, Github, Instagram) that I can then call with my reverse-proxy to any (client) applications I want (think of it like an API-manager). Also, I am using an LXC-container to do this. For example, here is the simplest of code that I hacked from the examples on the Twisted Docs: from twisted.internet import reactor from twisted.web import proxy, server from twisted.python.log import startLogging from sys import stdout

Docker介绍

天涯浪子 提交于 2019-12-31 00:41:54
Docker 是 Golang 编写的, 自 2013 年推出以来,受到越来越多的开发者的关注。如果你关注最新的技术发展,那么你一定听说过 Docker。不管是云服务还是微服务(Microservices),越来越多的厂商都开始基于 Docker 作为基础设施自动化的工具。那么什么是 Docker?Docker与传统的虚拟机有什么区别?为何要采用 Docker?如何使用 Docker? 本文,就针对上述提到的问题,来简单介绍下 Docker。 什么是 Docker Docker 是开源的应用容器引擎。 Docker 可以让你将所有应用软件以及它的以来打包成软件开发的标准化单元。 Docker 容器将软件以及它运行安装所需的一切文件(代码、运行时、系统工具、系统库)打包到一起,这就保证了不管是在什么样的运行环境,总是能以相同的方式运行。就好像 Java 虚拟机一样,“一次编写,到处运行(Write once, run anywhere)”,而 Docker 是“一次构建,到处运行(Build once,run anywhere)”。 Docker 是一种“容器即服务”(Docker Containers as a Service ,简称 CaaS),使得开发和IT运营团队可以对于应用的构建、发布、运行更加敏捷和可控。 概况的说: Docker 是为开发人员和系统管理员用于构建、发布

Can't run Docker container due device mapper error

北慕城南 提交于 2019-12-30 00:32:05
问题 I just can't create and run new containers in Docker anymore. But in the same time a can run previously created containers. When I try to do something like this: [user@host ~ ] docker run --name=fpm-5.3 debian:jessie 2014/07/12 07:34:08 Error: Error running DeviceCreate (createSnapDevice) dm_task_run failed From docker.log : 2014/07/12 05:57:11 POST /v1.12/containers/create?name=fpm-5.3 [f56fcb6f] +job create(fpm-5.3) Error running DeviceCreate (createSnapDevice) dm_task_run failed [f56fcb6f]

Fastdfs手动上传和下载命令使用

情到浓时终转凉″ 提交于 2019-12-26 17:08:59
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 项目中目前使用的FastDFS做文件存储,但是最近项目并发量有点高,经常出现文件下载和上传时间较长的情况,这是需要排查是因为网络延迟、请求阻塞或者FastDFS的问题。 如何排查是否是FastDFS问题而不是网络延迟导致的,我们最好可以在部署FastDFS的服务器上手动执行上传和下载,因为FastDFS目前没有在维护导致这方面的资料比较少,所以记录下来方便有需要的朋友使用。 上传 fdfs_test /etc/fdfs/client.conf.sample upload ~/2.png 执行结果: This is FastDFS client test program v5.09 Copyright (C) 2008, Happy Fish / YuQing FastDFS may be copied only under the terms of the GNU General Public License V3, which may be found in the FastDFS source kit. Please visit the FastDFS Home Page http://www.csource.org/ for more detail. [2018-07-03 11:37:02] DEBUG

Ubuntu下LXC/LXD常用配置

我怕爱的太早我们不能终老 提交于 2019-12-26 15:11:01
# ubuntu版本 sudo lsb_release -a # 初始化配置 Initial configuration sudo lxd init # container 创建ubuntu容器样例 lxc launch ubuntu:16.04 first # 显示可用镜像 lxc image list images: | less lxc image list images: 'centos' # LXD/LXC 2.0使用清华镜像加速的方法: 创建一个remote链接,指向镜像站即可,或替换掉默认的images链接。 lxc remote add tuna-images https://mirrors.tuna.tsinghua.edu.cn/lxc-images/ --protocol=simplestreams --public # 显示可用清华镜像 lxc image list tuna-images: # 显示当前远程可用 lxc remote list # 显示容器网络 lxc network show lxdbr0 # 显示容器 lxc list # 运行容器bash lxc exec first -- /bin/bash # 直接运行容器命令 lxc exec first -- apt-get update # 文件传输下载 lxc file pull