LXC

LXC is an operating system-level virtualization method for running multiple isolated Linux systems (containers) on a single control host. LXC provides operating system-level virtualization by providing a virtual environment that has its own process and network space. LXC relies on the Linux kernel cgroups functionality. LXC is similar to other OS-level virtualization technologies on Linux such as OpenVZ and Linux-VServer, as well as those on other operating systems such as FreeBSD.

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I am new to kubernetes and have started building a cluster on RHEL 7.3. I have kubernetes cluster setup on the master. When i try to use kubeadm join --token ancdbs.askdcvasdckasd x.x.x.:6443 The node is not able to join with following error message.

[discovery] Trying to connect to API Server "10.26.24.37:6443" [discovery] Created cluster-info discovery client, requesting info from "https://10.26.24.37:6443"

[discovery] Failed to connect to API Server "10.26.24.37:6443": there is no JWS signed token in the cluster-info ConfigMap. This token id "a7d815" is invalid for this cluster, can't connect

current version on master/nodes are as shown below.

Kubeadm version node:
kubeadm version: &version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.0",
GitCommit:"d3ada0119e776222f11ec7945e6d860061339aad", GitTreeState:"clean",
BuildDate:"2017-06-29T22:55:19Z", GoVersion:"go1.8.3", Compiler:"gc",
Platform:"linux/amd64"}

Kubeadm version master:
kubeadm version: &version.Info{Major:"1", Minor:"7", GitVersion:"v1.7.0",
GitCommit:"d3ada0119e776222f11ec7945e6d860061339aad", GitTreeState:"clean",
BuildDate:"2017-06-29T22:55:19Z", GoVersion:"go1.8.3", Compiler:"gc",
Platform:"linux/amd64"}
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Containers & Docker to Create a Powerful Team
Containers & Docker to Create a Powerful Team

Containers are an incredibly powerful technology that can provide you and/or your engineering team with huge productivity gains. Using containers, you can deploy, back up, replicate, and move apps and their dependencies quickly and easily.

We've NodeJS applications running inside docker containers. Sometimes, if any process gets locked down or due to any other issue the app goes down and we've to manually login to each container n restart the application. I was wondering if there is any sort of control panel that allow us to easily and quickly restart those and see the whole health of the system.

Please Note: we can't use --restart flag because essentially application doesn't exist with exist code. It run into problem like some process gets blocked, things are just getting bogged down vs any crashes and exist codes. That's why I don't think restart policy will help in this scenario.
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i want to juju bootstrap localhost but the client cannot connect to the lxd daemon during installation..it seems to be a routing problem. both subnets are on the same vlan.

vlan 400

192.168.10.0/24
10.14.162.0/24

root@maas:~# ifconfig
ens160    Link encap:Ethernet  HWaddr 00:50:56:99:5f:63  
          inet addr:192.168.10.1  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fe99:5f63/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:390619 errors:0 dropped:5 overruns:0 frame:0
          TX packets:68215 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:534722073 (534.7 MB)  TX bytes:19579105 (19.5 MB)

ens192    Link encap:Ethernet  HWaddr 00:50:56:99:14:a0  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:469882 errors:0 dropped:0 overruns:0 frame:0
          TX packets:351 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:555261395 (555.2 MB)  TX bytes:34514 (34.5 KB)

ens224    Link encap:Ethernet  HWaddr 00:50:56:99:12:b9  
          inet addr:192.168.178.114  Bcast:192.168.178.255  Mask:255.255.255.0
          inet6 addr: fe80::250:56ff:fe99:12b9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8611 errors:0 dropped:0 overruns:0 frame:0
          TX packets:217 errors:0 dropped:0 overruns:0 …
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I have one docker server called PRIVREG with a private registry on it

I can push and pull to that registry  from the docker  engine on the same box

if I goto another box named DOCKER901I can CURL a list of tags in the remote server with the command

curl http://privreg:5000/v2/ssmith/mybusybox/tags/list at it works fine as exected and returns a list of tags in that repo

but if I attempt to pull one with docker pull http://privreg:5000/v2/ssmith/mybusybox:1.0

i get  the error    Invalid repository name (ex: "registry.domain.tld/myrepos")


this is the same URL why does it error like this?
??

thanks!
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I am very familiar with VMs and virtulization. However, I have only heard about Docker (never used it) and would like to grasp the idea and concept.

I understand Docker creates 1 or more individual "worlds" similar to VMs, but uses a lot less resources?
Can you explain more about docker as well as how it is difference from VMs (vmware, Xen, KVM).
1
Hello, I can't found an control panel for docker, for: deploy, create, remove and assign ports to containers.

Anyone can suggest a free or paid one?
0
where and how can I install "govc"?


this is in response to my other question an error I am getting using docker machine

"Error creating machine: exec: "govc": executable file not found in $PATH"
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I am sure it is something like

docker-machine create --driver --vmwar****????!!!.......................................

what is the exact systax for docker machine to provision to vcenter?????


thanks
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no real problem here I am just wondering why it says this in the dolphin gui about docker??
kimubuntu-error.PNG
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docker info command results / docker run -d -m 1500mb nginx resultsam running swarm in "binpack" mode and my first node "ubuntu-Docker1" is clearly out of memory but will not put any contrainers on the other hosts ???

I am not sure why this is , any help would be very appreciated !!!!!!!



a "docker info" shows

Containers :42
Role: Primary
Srategy : BINPACK

nodes :3
ubuntu-docker 1
containers:42
Reserved memory : 2.93GiB / 4.054 Gib

ubuntu-docker2

containers : 0
Reserved memory : 0 B/ 1.019 GiB

when I attempt to run another container I get the errror ""error response from daemon : no resources available to schedule container"

thanks
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Free Tool: ZipGrep
LVL 9
Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

I have heard second hand that you dont want to use the lxc execution driver in docker  do to security issues.

does anyone know exactly why this is ???


thanks
0
Linux containers are abbreviated as LXC. They are the forms of lightweight operating system level virtualization for computers that are running Linux. Containers do not provide the virtual machine but provide a virtual environment where the containers share the same operating system as the host.

This is accomplished with some key features:
  1. Chroot
  2. Namespaces
  3. Cgroups
These features create an environment that allowd the running of multiple containers concurrently on the same host. The idea behind a container is to implement a technology that would enable separate processes to run together without the requirement of any other operating system or hypervisor applications. Containers share the same kernel with anything else that is running on it, but they can have constraints on the usage of resources like CPU, memory, hard drive or I/O. This Linux feature has been out in the version 2.6.24 of the operating system.

Concept behind the Implementation of Linux Containers

Containers are considered a better alternative to the traditional hypervisors like ESXi, Xen and so on. The hypervisor is an emulated hardware for the virtual machine and on the top of these virtual machines. Users used to have memory and applications. With the help of a hypervisor, you can have multiple virtual machines on a physical server. It is effectively like virtualizing a system at the hardware level.

If you want to have multiple …
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Expert Comment

by:Temody
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Virtualization Lover
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Expert Comment

by:SHARANAPPA BANAKARA
Comment Utility
nice article...yes definitely replacement for esx hyper visor.
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Virtual Machine and Containers are both techniques for virtualization and in many scenario either can be used. Though Virtual Machine and Container are similar in many ways, they both have there own space and can coexist in the same ecosystem. 

Virtual Machines utilize a concept called “Virtualization” to utilize resources on a machine to create one or virtual machines running its own operating systems. The primary machine is often referred as “Host” and virtual machines as “Guest”. These virtual machines are created by the virtualization software like VirtualBox or Vmware by intercepting access to certain hardware components and certain features from the host machine.

Containers utilize operating-system-level virtualization method. It requires OS kernel support which allows multiple isolated user space instances sharing host operating system resources. These instances are often called containers. LXC provides container support for Linux and very recently Microsoft announces container support for Windows ecosystem via Windows Server Containers. Docker is an open platform to build, ship, and run distributed applications as containers.
Though Virtual Machine and Containers are both virtualization …
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When I try to run Docker, I get a problem.  The message is right: a URL is broken.  I know that ubuntu.com is not completely down.  I tested it.  But the URLs in the error log don't work (like the error says).  How do I get Docker to use correct working URLs?  What are the working URLs?

Here is what I try to run:

docker build -t some-content-nginx .

Open in new window


Here is what I get:

Get:22 http://archive.ubuntu.com trusty-security/universe amd64 Packages [130 kB]
Err http://archive.ubuntu.com raring/main amd64 Packages
  404  Not Found [IP: 91.189.92.200 80]
Err http://archive.ubuntu.com raring/universe amd64 Packages
  404  Not Found [IP: 91.189.92.200 80]
Fetched 20.8 MB in 14s (1403 kB/s)
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/main/binary-amd64/Packages  404  Not Found [IP: 91.189.92.200 80]

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/raring/universe/binary-amd64/Packages  404  Not Found [IP: 91.189.92.200 80]

E: Some index files failed to download. They have been ignored, or old ones used instead.
INFO[0015] The command [/bin/sh -c apt-get update] returned a non-zero code: 100

Open in new window

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This article is a product of a couple of things, the first part comes from research I gathered during a masters course on Leading Change and Innovation and the second part is just my nerdy interest in computer technology, in particular VMware virtualization and Unix/Linux.

Trip down virtual memory lane

How quickly we forget what an undertaking this was to do for VMware’s founders. Sure virtualization had been around before, but only for mainframe systems and no one ever thought or even asked for virtualization for the cheaper x86 platforms. In the late 90s, PCs were manufactured by many different vendors, with different components. The task of virtualizing x86 was a complex problem and took a lot of work, and by 1999 we were introduced to VMware Workstation.

I remember, it was like magic and we were in awe of of VMware’s innovations with Workstation. It was novel and both system administrators and developers geeked out on what they could do with the the hosted system. I learned their VI3 (Virtual Infrastructure 3) technology in 2007 and lost my mind over it. vMotion was just about the sexiest thing I'd ever seen and I am happy to have been able to learn vmfs and the intracacies of virtual machine files and how everything worked across ESX hosts. It was a beautiful thing to me.

This is all ancient history today and virtualization for x86 is considered a commodity. There are tons of open source and hyper converged solutions, which is great for IT admins …
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LXC

LXC is an operating system-level virtualization method for running multiple isolated Linux systems (containers) on a single control host. LXC provides operating system-level virtualization by providing a virtual environment that has its own process and network space. LXC relies on the Linux kernel cgroups functionality. LXC is similar to other OS-level virtualization technologies on Linux such as OpenVZ and Linux-VServer, as well as those on other operating systems such as FreeBSD.

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