Questions tagged [docker]
Docker is an application to create containers for applications.
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Why does docker run busybox timeout not work?
I'm trying to make a script to quickly test whether the network connection works inside docker using busybox.
All of these tests failed to timeout after 5 seconds (they took 30 seconds to timeout):
...
0
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0answers
11 views
Linux cgroup memory is not beeing freed
I have an k8s cluster and one of the pods is crashing because of OOM.
It has the limit of 400MB but crashing when pod reaches 30MB and I have no idea why. There is no other process in its cgroup but ...
0
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0answers
33 views
Cannot Install Docker on Kali Linux 2019.1
I followed the instructions on the official page for Docker but add-apt-repository fails with
Error: could not find a distribution template for Kali/n/a.
I tried also this medium guide but it ...
0
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0answers
24 views
Permission denied inside docker container
I have ssh'd into a CentOS 7 docker container as root. I am trying to create a directory (mkdir mydir/test) but I am getting a permission denied error. I tested to make sure I was root with
whoami
...
0
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0answers
16 views
Mount ISO contained in Docker to host volume
Is there any way to mount an ISO contained in a Docker so that the contents of the ISO are available to the host machine?
I can do this on a Linux host by using a bind mount with shared as the bind ...
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0answers
23 views
Change default interface docker container
I'm struggling with this problem for two days.
Assumptions:
Docker network (and interface) named docknet type bridge subnet 172.18.0.0/16
Two interfaces eth0 (192.168.1.1) and eth1 (192.168.2.1)
...
0
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1answer
49 views
What can be the source of this docker-compose error message: … Cannot set property TasksAccounting, or unknown property
Im running a RHEL 7.3 server with docker-compose 1.25.x & docker 1.13.1
After putting all my file in a directory called Volume, I run the docker-compose as indicated by the product editor command ...
1
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1answer
25 views
Apache2 returning “APACHE_RUN_DIR” error on docker container
When trying to start my roundcube mailserver on a docker container I get the apache error:
AH00111: Config variable ${APACHE_RUN_DIR} is not defined
apache2: Syntax error on line 80 of /etc/apache2/...
-1
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1answer
18 views
Virtual Box, Vagrant, Docker - vmdk ssh damaged?
CentOS 7 host o/s, guest o/s.
VirtualBox-6.0-6.0.4_128413_el7-1.x86_64
Virtualbox Guest Additions 6.0.4
Host kernel 3.10.0-957.1.3.el7.x86_64
Guest kernel 3.10.0-957.10.1.el7.x86_64
Guest file ...
1
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0answers
21 views
Docker Debian, getting some specific syslog in the docker container log
I have been installing SSH in the Debian Docker. Since I wanted to have some extra log, I also installed the Rsyslog as described in this question.
Result was that some extra logs are created e.g. ...
0
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1answer
18 views
How to open a port to specific IPs in iptables while using docker?
I have a postgreSQL database inside of Docker that I don't want to expose it to the host network as it causes all users to see the exposed database port. (For now I don't have a pfsense or anything ...
2
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1answer
103 views
How to get mount information of host inside a docker container
I need the mountpoints of all disks attached to a host inside a docker container. The mount information is available in /proc/1/mounts file, but I cannot access that file on all OS.
When I run the ...
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0answers
64 views
Could not bind socket: Address already in use
I'm using port 8082 in dockerfile: ENV FILESERVER_PORT 8082.
When starting seafile with:
sudo bash /opt/seafile/seafile-server-6.3.4/seafile.sh start
I get the error http-server.c(2197): Could not ...
0
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0answers
23 views
Running a Dockerfile fails when executing CD command
FROM ubuntu
USER root
ENV BUNDLE_SILENCE_ROOT_WARNING=1
RUN apt-get update && apt-get -y install curl gnupg unzip wget
# Install Nginx.
RUN set -ex && \apt-get install -y software-...
0
votes
2answers
84 views
sudo command not found
I got my init.sh file for installing seafile. When calling:
if [ ! -f /config/init_completed ]; then
...
else
# start seafile
sudo bash ${INSTALLPATH}seafile.sh start
sudo bash ${...
1
vote
1answer
57 views
“Cannot create directory … no such file or directory”
When executing the dockerfile, the command RUN cp -rf roundcubemail-1.2.3/. /var/www/html/ is executed and I'm getting the following error:
cp: cannot create directory '/var/www/html/': No such file ...
1
vote
1answer
42 views
“docker-compose build” returning “exec format error”
When running the "docker-compose build" command, I'm running the following error:
standard_init_linux.go:207: exec user process caused "exec format error"
ERROR: Service 'seafile' failed to build: ...
-4
votes
1answer
37 views
How shall I find out all the terminal types that can work?
How shall I find out all the terminal types that can work?
On Lubunu 18.04, The followings work
$ TERM=xterm top
$ TERM=vt100 top
but the following don't:
$ TERM=lxterminal top
'lxterminal': ...
0
votes
1answer
59 views
Is there something which a container can't be used for while a Linux virtual machine can?
When would you choose to use a Linux virtual machine instead of a docker container?
Is there something which a docker container can't be used for while a Linux virtual machine can?
Is it correct ...
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0answers
23 views
Does a Docker image file require anything about the host Linux OS?
Docker image files distributed on Docker Hub can have different packages already installed. Can I run any image file on my up-to-date 64 bit Lubuntu 18.04?
Does a Docker image file require anything ...
0
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1answer
42 views
Does every docker container directly present only a shell?
Does every docker container directly present only a shell ?
I have a python image:
$ sudo docker image list
REPOSITORY TAG IMAGE ID CREATED SIZE
...
2
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1answer
33 views
Overlay storage driver internals
A follow-up from this question.
My further reading on Docker storage drivers revealed that the overlay driver merges all the image layers into lower layers using a hard link implementation which ...
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votes
1answer
47 views
What is “a light-weight namespace container” created by systemd-spawn?
man systemd-nspawn says
systemd-nspawn may be used to run a command or OS in a light-weight namespace container.
In many ways it is similar to chroot(1), but more powerful since it fully ...
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votes
0answers
36 views
Where can I find all the possible Go templates?
docker inspect has an option
--format , -f Format the output using the given Go template
Where can I find all the possible Go templates that can be used with docker inspect -f?
Thanks.
1
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1answer
33 views
Running Docker containers with different storage drivers
Is it possible to launch different Docker containers with different storage drivers? For example, container 1 with AUFS and container 2 with Overlay2?
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2answers
95 views
Why does a CentOS Docker container says it is Ubuntu?
I am trying to verify When choosing a Docker container image file for my Ubuntu, what do I need to match between them?
On Lubuntu, a CentOS container says it is CentOS, by
$ sudo docker run centos ...
1
vote
2answers
36 views
How shall I use `docker rm -v`?
Manpage of docker rm says
Remove a container and its volumes
$ docker rm -v redis
redis
This command will remove the container and any volumes associated with
it. Note that if a volume was ...
1
vote
1answer
273 views
Dockerfile - debian Jessie 404: packages not found [closed]
I'm trying to set up a docker container on Debian 9.8, but I keep getting the following error when I run docker-compose up -d:
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/...
-3
votes
1answer
69 views
What is a docker container from Linux's point of view? [closed]
A docker container is a concept understood by docker daemon.
What is a docker container from Linux's point of view?
You can stop, kill and destroy a container. Is a container itself a
process?
Is a ...
1
vote
1answer
25 views
Is Docker Machine only used when dockerd is running in virtual machines not in actual machines?
https://docs.docker.com/machine/overview/#whats-the-difference-between-docker-engine-and-docker-machine says
Docker Machine is a tool for provisioning and managing
your Dockerized hosts (hosts ...
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0answers
20 views
Does “Docker Machine” consists of `docker-machine` and `docker` or just `docker-machine`?
https://docs.docker.com/machine/overview/#whats-the-difference-between-docker-engine-and-docker-machine says
Docker Machine is a tool for provisioning and managing
your Dockerized hosts (hosts ...
-3
votes
1answer
39 views
Can the virtual machines created by Docker be used in a standalone way without Docker?
Docker can creat virtual machines to be used as nodes in swarms.
Can the virtual machines created by Docker be used in a standalone way without Docker, or are they only usable by Docker?
For ...
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votes
1answer
57 views
Does Docker work with VirtualBox but not with KVM/QEMU?
Docker can creat virtual machines to be used as nodes in swarms.
The machine drivers contains VirualBox but no KVM/QEMU. Does it mean that
virtual machines created by KVM/QEMU can't be used as ...
1
vote
2answers
45 views
Do `docker container rm` and `docker container kill` effectively achieve the same?
From manpages:
docker container rm will remove one or more containers from the host
node. The container name or ID can be used. This does not remove
images.
docker container kill: The ...
-2
votes
1answer
33 views
Does tagging a Docker image create a copy of the image?
Does tagging a Docker image create a copy of the image?
It seems to me tagging by itself shouldn't.
But the following command seems to imply so.
Thanks.
$ docker image ls
REPOSITORY ...
0
votes
1answer
99 views
Error when installing docker on Debian 9 stretch: repository … does not have a Release file
When trying to install docker on Debian 9.8 I get the following error message when running sudo apt update or sudo apt-get update:
E: The repository 'cdrom://[Debian GNU/Linux 9.8.0 Stretch - ...
-4
votes
1answer
38 views
How can I install a package in a Docker Ubuntu container?
I use the default downloaded Ubuntu Docker image. I want to find the network interfaces and IP addresses in its container, so I would like to install the package containing ifconfig, but why do I fail?...
1
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0answers
217 views
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/main/binary-amd64/Packages 404 Not Found [IP: 151.101.140.204 80] [duplicate]
I'm trying to get a project running locally on Deepin. The project relies on node 6.10, I understand that it's an old version but it works.
When the Dockerfile tries to run the sudo apt-get update, it ...
0
votes
0answers
21 views
Mapping Docker container UDP port to different host port causes only partial communication failure [migrated]
I have a game server running inside a Docker container that listens on UDP port 1111 (EXPOSE 1111/udp). When I publish this server on the same port on the host (-p 1111:1111/udp) everything works as ...
0
votes
1answer
41 views
Centos7 Host, KVM pfSense domain, and Docker in a box
I am trying to get routing straight on my server.
From the pfSense domain, I can ping IPs in the management and DMZ networks.
From the virtual host, I can ping the same IPs
pfSense is the gateway for ...
0
votes
1answer
41 views
Docker running an app with NET_ADMIN capability: involved risks
I'm trying to run an app in a docker container.The app requires root privileges to run.
sudo docker run --restart always --network host --cap-add NET_ADMIN -d -p 53:53/udp my-image
My question is:
...
0
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0answers
58 views
File - can't access xxx - bad address
Docker on raspbian suddenly stopped working.
I tried to restart/rebuild the image and then reinstall the docker without success.
the problem seems to come from the directory /var/lib/docker/overlay2/
...
1
vote
1answer
75 views
Alpine Linux apk add gives permission error
I'm trying to install packages in a docker image based on alpine. The host system is CentOS system, system-release: CentOS Linux release 7.6.1810 (Core).
Here's what I do:
# docker run -td alpine:3....
2
votes
1answer
156 views
Can't install openjdk8-jre in Docker Alpine Linux image
Alpine 3.7 and 3.9. apk add htop works fine. apk add openjdk8-jre hangs forever. Problem step:
(25/36) Installing openjdk8-jre-lib (8.201.08-r0)
usr/ (dir)
usr/lib/ (dir)
usr/lib/jvm/ (dir)
usr/lib/...
0
votes
0answers
85 views
SSH works but not SFTP
I am working on a project for a client from which we are using multiple docker containers on a host machine. I need to copy some files from my computer to the host machine, but when using an SFTP-...
0
votes
0answers
27 views
Jenkins Docker exec : No such file or Directory
I installed Jenkins using below command
sudo docker run -u root -d -p 8081:8081 -p 50001:50001 -v /data/jenkins-data:/var/jenkins_home -v /var/run/docker.sock:/var/run/docker.sock ...
1
vote
1answer
38 views
Is it possible to run a script on the host machine when a docker container starts or stops
I am to start a docker container and bind an IPv6 address to it by running docker run -itd --restart=always --name=<container> --net=br6 --ip6=2001:db8:8:2::100 <image>. However, I have to ...
0
votes
1answer
33 views
Syslog to console, drawbacks?
I am wondering are there any drawback (performance wise) when output from some software is not logged to a file, but instead to console?
Specific case would be running Docker containers, as some of ...
0
votes
0answers
13 views
How to simulate a Timeout on the dockerd processes?
Does anyone have any suggestion on how to simulate a timeout of the dockerd demon?
I have tried kill -SIGSTOP ; but the dockerd demon does not restart even though it has a systemd setting of ...
2
votes
1answer
30 views
Terminal runs commands on startup and I cannot find where they are coming from
I have accidentally put winehq.key into /etc/bash_completion.d/ in the process of docker-machine completion installation.
I've tried to set up docker-machine auto completion and followed these ...
