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I am trying to shutdown a kvm on a centos using virsh shutdown vm1 command. I checked to see if the ACPI feature is present in the specification xml using virsh dumpxml vm1 | grep -F acpi and it is. What am I missing here? I don't want to force shutdown the vm.
The acpid daemon process must be running in the VM guest or it will not respond to the request from the hypervisor.
From inside the guest:
service acpid status
should return the running acpid. If it does not try:
sudo yum install acpid
sudo chkconfig acpid on
sudo service acpid start
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I've installed GitLab ee on Docker. I'd like to use authentication via ssh instead password but each time I try to authenticate, connection is closed. SSH Port is 1122->22 so I'm connecting with git#gitlab.example -p 1122. I also enabled the port in ufw, checked if openssh server is running in the container.
Error: Connection closed by HOST port 1122
I was searching long time but I didn't find anything so I'll be glad for any suggestion.
Potential problem with Docker and UFW
Time ago I was wondering how to work with both UFW and Docker together (The GitLab service doesn't seem to be the problem, pretty sure you could have had the same problems with any service at all).
Check out this thread: What is the best practice of docker + ufw under Ubuntu
And also consider this:
To persist the iptables rule install the linux package iptables-persistent according to your server distro, in my case (Debian) is sudo apt install iptables-persistent and the package installation will add the NAT rule to a persistent file which is executed on boot. ~afboteros
Potential problem with Gitlab and Docker
When using Gitlab through Docker, some "heavy port-binded" services like SSH might need you to configure them to the exposed port. Maybe if you set the SSH service to the 1122 as you intended to, and binding it like that on the Dockerfile maybe you could make it work.
Official Gitlab documentation
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I am trying to add private registry in docker on ubuntu machine, using nexus as repository
below is the screenshot of nexus configurations
in docker host i have added DOCKER_OPTS="--insecure-registry=xx.xx.xx.xx:8083" to /etc/default/docker
after these changes i did docker restart using below commands
systemctl daemon-reload
systemctl restart docker
now when i execute docker info its not showing up my private registry
is anything missing in my configurations
Try adding insecure registry entry in /etc/docker/daemon.json
file content
{ "insecure-registries":["registry.example.com"] }
restart the docker deamon
sudo systemctl restart docker
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On Windows, I've always been able to build Docker images with no problems.
I'm now trying to build a simple Docker image on Ubuntu 18.04 and typing in the terminal:
sudo docker build -t test .
results in the following error:
Cannot connect to the Docker daemon at unix:///var/run/docker.sock.
Is the docker daemon running?
How do I start the Docker daemon? I want to be able to build the image successfully
EDIT:
Typing sudo systemctl start docker as stated in the original documentation https://docs.docker.com/config/daemon/systemd/ results in the following error:
Failed to start docker.service: Unit docker.service is masked.
You can configure docker to start on boot :
sudo systemctl enable docker
The ugly way : start docker manually :
dockerd &
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I use docker for mac and did create any other vm after install.
And I use spujadas/elk-docker to run elk.
The log shows vm.max_map_count is too low.
So my question is how to change it on local vm?
docker-machine can not list any local machine.
So i can't ssh to local vm and modify it?
The troubleshooting section mentions:
In particular, the message max virtual memory areas vm.max_map_count [65530] likely too low, increase to at least [262144] means that the host's limits on mmap counts must be set to at least 262144.
Use sysctl vm.max_map_count to view the current value, and see Elasticsearch's documentation on virtual memory for guidance on how to change this value.
sysctl -w vm.max_map_count=262144
Note that the limits must be changed on the host; they cannot be changed from within a container.
You can ssh to the default machine with docker-machine ssh (which must exist if you ever run any container).
See Install Elasticsearch with Docker:
OSX with Docker Toolbox
The vm_max_map_count setting must be set via docker-machine:
docker-machine ssh
sudo sysctl -w vm.max_map_count=262144
If you have docker for Mac and its whyve VM, see this thread:
screen
~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty
To exit:
CTRL+A CTRL+\ followed by "y"
You will see a similar recommendation in "Install Elasticsearch with Docker":
The vm_max_map_count setting must be set within the xhyve virtual machine:
$ screen ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/tty
Log in with root and no password.
Then configure the sysctl setting as you would for Linux:
sysctl -w vm.max_map_count=262144
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I bought a server for experimenting with docker. Now I need an OS, that docker can run on it. Which OS would you recommended to me? CoreOs, RancherOS, etc.
How about service discovery?
I want to run my microservices on container, that is my target.
Docker is compatible with Linux, Mac OS X, or Windows. I will prefer Linux as in Linux your machine will act as a localhost and the Docker host, in networking, localhost means your computer and the Docker client, the Docker daemon, and any containers run directly on your localhost while in Windows the docker daemon is running inside a Linux virtual machine. You will use the Windows Docker client to talk to the Docker host VM. Your Docker containers run inside this host.
Docker on Windows
Docker on Linux