My host machine is MAC and I have installed Docker on my machine.
1.) Have downloaded the mysql:5 image and started container from the same :-
docker container run -d -e MYSQL_ROOT_PASSWORD=password -e MYSQL_DATABASE=learners --network bridge mysql:5
2.) Now I have logged into the Docker container, using the default bridge :-
(base) aditya#aditya-MAC PROJECTS % docker container exec -it c4 bash
root#c4abb2947a1f:/usr/local/bin#
root#c4abb2947a1f:/usr/local/bin#
root#c4abb2947a1f:/usr/local/bin# ping google.com
PING google.com (142.250.193.238) 56(84) bytes of data.
^C
--- google.com ping statistics ---
7 packets transmitted, 0 received, 100% packet loss, time 2090ms
root#c4abb2947a1f:/usr/local/bin#
root#c4abb2947a1f:/usr/local/bin#
3.) On my host machine, here are networks I have :-
(base) aditya#aditya-MAC ~ % docker network ls
NETWORK ID NAME DRIVER SCOPE
c0bcfcc8b9ac aditya-network bridge local
197c1cbd4534 bridge bridge local
e7b2d1393818 docker-hadoop_default bridge local
cf84498b715b host host local
69dd81905f0a ksql-course-master_default bridge local
c0c5220ade8f none null local
(base) B0218162#APB-LTB0218162-MAC ~ %
Inside my docker, I am able to install any package like apt-get install iputils-ping.
Any help shall be highly appreciated.
Update all Repos with command -> apt update
Install iputils with command -> apt install iputils-ping
This worked for my system so I guess it should work for you too.
Related
I'm running Scylladb locally in a docker container and I want to access the cluster outside the docker container. That's when I'm getting the following error: cassandra.cluster.NoHostAvailable: ('Unable to connect to any servers')
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Address Load Tokens Owns Host ID Rack
UN 172.17.0.2 776 KB 256 ? ad698c75-a465-4deb-a92c-0b667e82a84f rack1
Note: Non-system keyspaces don't have the same replication settings, effective ownership information is meaningless
Cluster Information:
Name: Test Cluster
Snitch: org.apache.cassandra.locator.SimpleSnitch
DynamicEndPointSnitch: disabled
Partitioner: org.apache.cassandra.dht.Murmur3Partitioner
Schema versions:
443048b2-c1fe-395e-accd-5ae9b6828464: [172.17.0.2]
I have no problem accessing the cluster using cqlsh on port 9042:
Connected to at 172.17.0.2:9042.
[cqlsh 5.0.1 | Cassandra 3.0.8 | CQL spec 3.3.1 | Native protocol v4]
Now I'm trying to access the cluster from my fastapi app that is outside the docker container.
from cassandra.cluster import Cluster
cluster = Cluster(['172.17.0.2'])
session = cluster.connect('Test Cluster')
And here's the Error that I'm getting:
raise NoHostAvailable("Unable to connect to any servers", errors)
cassandra.cluster.NoHostAvailable: ('Unable to connect to any servers', {'172.17.0.2:9042': OSError(51, "Tried connecting to [('172.17.0.2', 9042)]. Last error: Network is unreachable")})
with a little bit of tinkering, it's possible to achieve a connection to the Scylla running in a container outside of the container for local development.
I've tried on M1 Mac with docker desktop:
Run scylla container with couple of new parameters[src]:
--listen-address 0.0.0.0 for simplification as we are spawning Scylla inside the container to allow connection to the container from any network
--broadcast-rpc-address 127.0.0.1 required if --listen-address set to 0.0.0.0. We are going to port forward 9042 from container to host (local) machine, so this is an IP where it will be acessible.
The final command to spawn the container is:
$ docker run --rm -ti \
-p 127.0.0.1:9042:9042 \
scylladb/scylla \
--smp 1 \
--listen-address 0.0.0.0 \
--broadcast-rpc-address 127.0.0.1
The -p 127.0.0.1:9042:9042 is to make port 9042 accessible on host (local) machine.
Install pip3 install scylla-driver as it has support of darwin/arm64 architecture.
Write a simple python script:
# so74265199.py
from cassandra.cluster import Cluster
cluster = Cluster(['127.0.0.1'])
session = cluster.connect()
# Select from a table that is available without keyspace
res = session.execute('SELECT * FROM system.versions')
print(res.one())
Run your script
$ python3 so74265199.py
Row(key='local', build_id='71178cf6db7021896cd8251751b78b3d9e3afa8d', build_mode='release', version='5.0.5-0.20221009.5a97a1060')
Disclaimer: I'm not an expert in Scylla's configuration, so feel free to point out a better approach.
I installed Ubuntu on an older Laptop. Now there is Docker with Portainer running and I want to access Portainer via my main PC in the same network. When I try to connect to Portainer via my Laptop where it is runnig (not Localhost address) it works fine. But when I try to connect via my PC, I get a timeout. Windows diagnostics says: "resource is online but isn't responding to connection attempts". How can I open Portainer to my local network? Or is this a problem with Ubuntu?
so check if you have openssh server running for ssh! disable firewall on terminal sudo ufw disable check if your network card is running on name eth0 ifconfig if not change following this step below
Using netplan which is the default these days. File /etc/netplan/00-installer-config.yaml file. but b4 you need to get serial/mac
Find the target devices mac/hw address using the lshw command:
lshw -C network
You'll see some output which looks like:
root#ys:/etc# lshw -C network
*-network
description: Ethernet interface
physical id: 2
logical name: eth0
serial: dc:a6:32:e8:23:19
size: 1Gbit/s
capacity: 1Gbit/s
capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=bcmgenet driverversion=5.8.0-1015-raspi duplex=full ip=192.168.0.112 link=yes multicast=yes port=MII speed=1Gbit/s
So then you take the serial
dc:a6:32:e8:23:19
Note the set-name option.
This works for the wifi section as well.
if you using calbe you can delete everything add the example only change for your serial "mac" sudo nano /etc/netplan/00-installer-config.yaml file.
network:
version: 2
ethernets:
eth0:
dhcp4: true
match:
macaddress: <YOUR MAC ID HERE>
set-name: eth0
Then then to test this config run.
netplan try
When your happy with it
netplan apply
reboot you ubuntu
after restart
stop portainer container
sudo docker stop portainer
remove portainer container
sudo docker rm portainer
now run again on the last version
docker run -d -p 8000:8000 -p 9000:9000 \
--name=portainer --restart=always \
-v /var/run/docker.sock:/var/run/docker.sock \
-v portainer_data:/data \
portainer/portainer-ce:2.13.1
I'm setting a backup/ sync within an Ubuntu network using rsync.
Assume that a Desktop (Ubuntu 18.04)-ip: 10.0.0.13
Running a docker with two Containers :
Client_A: 2001 -> 22/tcp , 8001 -> 80/tcp
Client_B: 2002 -> 22/tcp , 8002 -> 80/tcp
All 3 images are ubuntu, apache2 installed and running
dir:
DesktopOS Container1 Container2
10.0.0.13:80 10.0.0.13:8001 10.0.0.13:8002
⊢var ⊢var ⊢var
⊢www ⊢www ⊢www
⊢html ⊢html ⊢html
⊢1.txt ⊢2.txt ⊢3.txt
all three txt can be accessed in browser
When i try to pull 3.txt to Container1:
rsync -av -e 'ssh -p 2002' --rsh=ssh user#10.0.0.13/var/www/html/ ~/BACKUP/
1.txt has received.
How to access the 3.txt in Container1?
Please use the IP Address since I am simulating a real network, maybe 1 docker on 1 device in the real world.
Finally I found I installed ssh only, doesn't install the ssh-server.
Otherwise, the firewall blocks the access.
#find out port 22, 2002, 2001 etc.
#from netstat result, is it listening?
netstat | grep 2002
Install ssh server
sudo apt install tasksel
sudo tasksel install openssh-server
for Firewall:
sudo ufw allow 2001,2002
and it solved, thanks for your patients who try to answer me.
I create a container by
docker run -d --name etcd \
-v /usr/share/ca-certificates/:/etc/ssl/certs \
quay.io/coreos/etcd:v3.0.4 /usr/local/bin/etcd -advertise-client-urls \
http://0.0.0.0:2379 -listen-client-urls http://0.0.0.0:2379
And use
docker exec 40cc9457f132 ifconfig
to get its IP "172.17.0.2"
And then I use local etcdctl to get data,
etcdctl --endpoint=http://172.17.0.2:2379 get /testdir/testkey1
but fail with:
Error: client: etcd cluster is unavailable or misconfigured
error #0: dial tcp 0.0.0.0:2379: getsockopt: connection refused
What should I do?
PS:
To make sure the data is actually stored on the container, I stoped local etcd first.
systemctl stop etcd
If I don't do that, I could get the data, but it's not the same with the result of
docker exec 40cc9457f132 etcdctl get /testdir/testkey1
"40cc9457f132 " is the container id.
OK， I fix it. It's the problem of version.
My local etcd is v2.2.4 (installed by apt install), and the etcd image version is v3.0.4.
I update both of them to v3.3.5 and set $ETCDCTL_API=3.
Now it seems all right.
It seems that same port use both localhost and docker container.
please assign another port for container. example 2379->2380
etcdctl --endpoint=http://localhost:2379 -> localhost
etcdctl --endpoint=http://localhost:2380 -> docker container
I solved it, se the edit at the end of the description.
I'm using Centos7 as a host and running docker version 17.05.0-ce
I'm able to pull images on to the host.
from inside a contiainer I'm able to ping the docker interface, I'm also able to ping the host machine. But thats it, I'm not able to ping any other hosts, not the dns on the local network, not google, nothing. I guess it's something with the routing, but I can't figure it out.
Anyone got an idea?
This is (obviously) not about connecting to other containers on the same host. but probably a problem with the routing or configuration in docker
jonmat ~ $ docker -v
Docker version 17.05.0-ce, build 89658be
# pulling images works fine, so the engine can connect to the internet
jonmat ~ $ docker pull alpine
Using default tag: latest
latest: Pulling from library/alpine
ff3a5c916c92: Pull complete
Digest: sha256:7b848083f93822dd21b0a2f14a110bd99f6efb4b838d499df6d04a49d0debf8b
Status: Downloaded newer image for alpine:latest
# pinging google dns from the host is is no problem
jonmat ~ $ ping -c1 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=56 time=5.16 ms
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 5.160/5.160/5.160/0.000 ms
# pinging google dns from inside the container won't work, probably some kind of routing issue?
jonmat ~ $ docker run -it --rm alpine ping -c1 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 0 packets received, 100% packet loss
EDIT:
I found the problem myself. someone other than me have also been using the host, and they added the option "--ptables=false" to dockerd, i removed this and it solved my problem.
Assuming your container is running with name alpine, can you try below command
docker exec -t alpine ping 8.8.8.8
In the example given above, seems you are missing some options, try this
docker run -it --rm -t alpine ping -c1 8.8.8.8
If container is already running use docker exec like posted above. (I would like to combine both answers, but unfortunately I am not finding option to delete and add it in the first answer itself)
Refer the docker exec for more details