I am using Azure IoT Edge to implement a IoT solution on Ubuntu 20.04. the edge computer setup CAN interface that is working using following command:
ip link set can0 type can bitrate 500000
This command works in Linux computer. Azure IoT Edge is a docker container, when I execute this command inside the container, it returns:
Cannot find device "can0"
When I type the following command in the container:
ip link ls
It does not have can0.
Does anyone know how to bind the CAN interface to docker?
I found that Azure IoT Edge is using Moby Engine, it seems have different behavior than docker. Since I have added
"createOptions": {
"NetworkingConfig": { "EndpointsConfig": { "host": {} } },
"HostConfig": {
"NetworkMode": "host",
"CapAdd": [ "NET_ADMIN" ],
"CapDrop": [ "CHOWN", "SETUID" ]
}
}
to the deployment.template.json. But the can0 does not exist.
Extra Information:
In the host, use command ip link ls, it returns
4: can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UP mode DEFAULT group default qlen 10
link/can
using command ifconfig, it returns
can0: flags=193<UP,RUNNING,NOARP> mtu 16
unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 10 (UNSPEC)
RX packets 1244494 bytes 9396052 (9.3 MB)
RX errors 2 dropped 0 overruns 0 frame 2
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
But in Azure IoT Edge, it has eth0 and lo only.
Related
Good morning,
I'm a new user of docker technology and I'm facing some issue.
Any help will be appreciated (I update the question, thanks to the questions provided by #JRichardsz).
Here the problem:
Docker Host: Ubuntu 20.04.2 LTS. This is a VMWare virtual machine
In the host no process is using port 80. (Running "sudo lsof -i :80" return no process name, if I do not start any docker image)
if I stop the running docker image by "docker compose down", I have 2 network interfaces:
docker0: flags=4099 mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
ether 02:42:2f:a6:ae:d2 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ens160: flags=4163 mtu 1500
inet 192.168.128.60 netmask 255.255.255.0 broadcast 192.168.128.255
inet6 fe80::250:56ff:fea6:60bb prefixlen 64 scopeid 0x20
ether 00:50:56:a6:60:bb txqueuelen 1000 (Ethernet)
RX packets 2929 bytes 251888 (251.8 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 424 bytes 53706 (53.7 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
when I start my docker image (this is a docker image provided by Xibo CMS developers), the network interfaces related to the docker image appears, and I'm able to view bridge information:
bridge name bridge id STP enabled interfaces
br-33e8e1916c0d 8000.024261f9ddaa no veth0b9040e
veth3c6ecf0
veth821b253
vethe879c11
docker0 8000.02422fa6aed2 no
when the docker is active, command "sudo lsof -i :80" provides me:
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
docker-pr 25417 root 4u IPv4 122292 0t0 TCP *:http (LISTEN)
docker-pr 25423 root 4u IPv6 122300 0t0 TCP *:http (LISTEN)
so web service inside docker image is active on all interfaces.
If I open a browser inside the Linux docker Host, looking at url http://127.0.0.1/ I can access the web server page without any problem
If I open a browser at http://192.168.128.80/ in a PC connected in the same subnet of ens160, I'm not able to reach the webserver.
Please note, no firewall is active (if I shutdown docker image by "docker compose down" command, and try from a PC connected in the same subnet of ens160 to open a telnet connection to port 80 in 192.168.128.80, I can capture packets using tcpdump)
After stopping the docker image, I performed the following commands on the docker host PC:
sudo python3 -m http.server 80
connecting from a different PC using putty telnet on port 80, I can see messages on the python example command line (so no firewall issues)
Is there anyone that can help me find why the webservice inside docker image can be accessed only when opening webpage from Linux Docker Host machine?
Any help will be very helpful.
I have installed HortonWorks Docker sandbox as peer instructions.
Which seems to be running, when I type:
sudo docker ps
It is shown that the sandbox is runing:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
23dbac10e27b hortonworks/sandbox-hdp:3.0.1 "/usr/sbin/init" 20 minutes ago Up 20 minutes 22/tcp, 4200/tcp, 8080/tcp sandbox-hdp
But when I visit localhast:8080 on the browser I do not get any response.
I also read that I should try ifconfig to verify the ip address:
Not sure what I should be looking in here:
br-193585a7edfa: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.18.0.1 netmask 255.255.0.0 broadcast 172.18.255.255
inet6 fe80::42:62ff:fe32:c2fc prefixlen 64 scopeid 0x20<link>
ether 02:42:62:32:c2:fc txqueuelen 0 (Ethernet)
RX packets 5 bytes 256 (256.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 24 bytes 3241 (3.2 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
EDIT:
I´m startung it with this command, no porst specified:
docker start sandbox-hdp
As shown in the instructions:
Also I get the same ports mapping that is shown in the documentation:
For container docker create separate network.
If you need mapping of port for container in this network to port in host system you should specify it with -p
you need
docker start -p <port_at_host_system>:<port_in_container> <image>
so run
docker start -p 8080:8080 sandbox-hdp
I am trying to connect(bind) to an OpenDJ server in Docker.
(I know how to connect to regular (not Docker) OpenDJ server)
OpenDJ seems to run, but when I try to connect to it with a ldap browser, it says "Unabled to connect"
--- Server Status ---
Server Run Status: Started
Open Connections: 1
--- Server Details ---
Host Name: 14e1e92e962e
Administrative Users: cn=Directory Manager
Installation Path: /opt/opendj
Instance Path: /opt/opendj/data
Version: OpenDJ Server 4.4.3
Java Version: 1.8.0_111
Administration Connector: Port 4444 (LDAPS)
--- Connection Handlers ---
Address:Port : Protocol : State
-------------:------------------------:---------
-- : LDIF : Disabled
0.0.0.0:161 : SNMP : Disabled
0.0.0.0:1389 : LDAP (allows StartTLS) : Enabled
0.0.0.0:1636 : LDAPS : Enabled
0.0.0.0:1689 : JMX : Disabled
0.0.0.0:8080 : HTTP : Disabled
--- Data Sources ---
Base DN: dc=example,dc=com
Backend ID: userRoot
Entries: 1
Replication:
[root#localhost ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
14e1e92e962e openidentityplatform/opendj "/opt/opendj/run.sh" 18 hours ago Up 18 hours
[root#localhost ~]# ifconfig
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
inet6 fe80::42:5ff:fe0f:a03 prefixlen 64 scopeid 0x20<link>
ether ******** txqueuelen 0 (Ethernet)
RX packets 5 bytes 254 (254.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7 bytes 647 (647.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.89 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::1db8:91e1:5276:4f9 prefixlen 64 scopeid 0x20<link>
ether ******** txqueuelen 1000 (Ethernet)
RX packets 796434 bytes 512206712 (488.4 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 479946 bytes 41277150 (39.3 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root#localhost ~]# docker run -it 1e03b62c213e /bin/bash
Instance data Directory is empty. Creating new DJ instance
BASE DN is dc=example,dc=com
Password set to password
Running /opt/opendj/bootstrap/setup.sh
Setting up default OpenDJ instance
Configuring Directory Server ..... Done.
Configuring Certificates ..... Done.
Creating Base Entry dc=example,dc=com ..... Done.
Starting Directory Server ...... Done.
To see basic server configuration status and configuration, you can launch
/opt/opendj/bin/status
Server Run Status: Started
The LDAP server is running at 192.168.0.89 with a port of 1389. So I try to connect with the below. I am unable to fetch Base DN as well. I tried putting the BaseDN manually too. I tried 172.17.0.1, but no luck. (It seems to be a docker ip. (ifconfig))
Question :
But with docker, do I need a different hostname? or IP? Or need additional configuration setup? (BTW, I put IP in hostname and successfully connected many times.)
Error message :
Error while opening connection
- Unable to connect
java.lang.Exception: Unable to connect
at org.apache.directory.studio.connection.core.io.api.DirectoryApiConnectionWrapper$1.run(DirectoryApiConnectionWrapper.java:251)
at org.apache.directory.studio.connection.core.io.api.DirectoryApiConnectionWrapper.runAndMonitor(DirectoryApiConnectionWrapper.java:1312)
at org.apache.directory.studio.connection.core.io.api.DirectoryApiConnectionWrapper.doConnect(DirectoryApiConnectionWrapper.java:281)
at org.apache.directory.studio.connection.core.io.api.DirectoryApiConnectionWrapper.connect(DirectoryApiConnectionWrapper.java:172)
at org.apache.directory.studio.connection.core.jobs.OpenConnectionsRunnable.run(OpenConnectionsRunnable.java:111)
at org.apache.directory.studio.connection.core.jobs.StudioConnectionJob.run(StudioConnectionJob.java:109)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:60)
Unable to connect
You need to publish ports 1389 and 1636.
Change your docker run command to
docker run -it -p 1389:1389 -p 1636:1636 <image ID> /bin/bash
You can also run your container is host networking mode where you don't need port mapping.
docker run -it --net=host <image ID> /bin/bash
Hope this helps.
look at your docker ps command, you do not publish any ports
add this to your docker run command:
-p 1389:1389 -p 1636:1636
On the host, there is a service
#server# netstat -ln | grep 3308
tcp6 0 0 :::3308 :::* LISTEN
It can be reached from remote.
The container is in a user-defined bridge network.
The server IP address is 192.168.1.30
#localhost ~]# ifconfig
br-a54fd3b63acd: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.18.0.1 netmask 255.255.0.0 broadcast 172.18.255.255
inet6 fe80::42:1eff:fecc:92e8 prefixlen 64 scopeid 0x20<link>
ether 02:42:1e:cc:92:e8 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.1 netmask 255.255.0.0 broadcast 172.17.255.255
inet6 fe80::42:37ff:fe9f:e4f1 prefixlen 64 scopeid 0x20<link>
ether 02:42:37:9f:e4:f1 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 34 bytes 4018 (3.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.30 netmask 255.255.255.0 broadcast 192.168.1.255
And ping from container also works.
#33208c18aa61:~# ping -c 2 192.168.1.30
PING 192.168.1.30 (192.168.1.30) 56(84) bytes of data.
64 bytes from 192.168.1.30: icmp_seq=1 ttl=64 time=0.120 ms
64 bytes from 192.168.1.30: icmp_seq=2 ttl=64 time=0.105 ms
And the service is available.
#server# telnet 192.168.1.30 3308
Trying 192.168.1.30...
Connected to 192.168.1.30.
Escape character is '^]'.
N
But the service can't be reached from the container.
#33208c18aa61:~# telnet 192.168.1.30 3308
Trying 192.168.1.30...
telnet: Unable to connect to remote host: No route to host
I checked
Make docker use IPv4 for port binding
make sure I didn't have IPv6 set to only bind on IPv6
# sysctl net.ipv6.bindv6only
net.ipv6.bindv6only = 0
From inside of a Docker container, how do I connect to the localhost of the machine?
find my route is a little different.
# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default router.asus.com 0.0.0.0 UG 100 0 0 eth0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
172.18.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-a54fd3b63acd
192.168.1.0 0.0.0.0 255.255.255.0 U 100 0 0 eth0
Does it matter? Or could it be another reason?
Your docker container is on a different network namespace and connected to a different interface than your host machine that's why you can't reach it using the ip 192.168.x.x
What you need to do is to use the docker network gateway instead, in your case 172.17.0.1 but be aware that this IP might no be the same from host to host so to reproduce this everywhere and be completely sure of which is the IP you can create an user-defined network specifying the subnet and gateway and running your container there for example:
docker network create -d bridge --subnet 172.16.0.0/24 --gateway 172.16.0.1 dockernet
docker run --net=dockernet ubuntu
Also whatever service you are trying to connect here must be listening on the docker's bridge interface as well.
Another option is to run the container on the same network namespace as the host with the --net=host flag, and in this case you can access service outside the container using localhost
Inspired by the official document
The Docker bridge driver automatically installs rules in the host
machine so that containers on different bridge networks cannot
communicate directly with each other.
I checked the iptables on the server, for an experiment I stopped the iptables temporary. Then the container can reach that service success. Later I was told, the server has been reboot recently. So guessing some config was lost after that reboot. Not familiar with iptables very much, and when I try
systemctl status iptables.service
It says the service is not installed. After I install and run the service,
iptables -L -n
is almost empty. Now not clue what kind of iptables rules can cause that messy.
But if anyone face the ping success telnet fail situation, iptables could be the place of the root cause.
I am trying to get neo4j to run on a minimal install of Centos 7.2, neo4j installed through yum.
However it seems to start booting up, but fails, shuts down, then restarts in a continuous loop:
2017-07-18 03:06:34.731+0000 INFO [o.n.k.i.DatabaseHealth] Database health set to OK
017-07-18 03:06:35.140+0000 WARN [io.netty.util.internal.MacAddressUtil] Failed to find a usable hardware address from the network interfaces; using random bytes: be:ac:2d:4b:9d:99:28:41
2017-07-18 03:06:35.226+0000 INFO [o.n.k.i.t.l.c.CheckPointerImpl] Check Pointing triggered by database shutdown [1]: Starting check pointing...
...
2017-07-18 03:06:35.335+0000 INFO [o.n.k.i.f.GraphDatabaseFacadeFactory] Shutdown started
ifconfig gives me:
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.240 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::f010:beff:fea8:314d prefixlen 64 scopeid 0x20<link>
ether f2:10:be:a8:31:4d txqueuelen 1000 (Ethernet)
RX packets 195385 bytes 316555671 (301.8 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 105586 bytes 7261323 (6.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1 (Local Loopback)
RX packets 7 bytes 391 (391.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 7 bytes 391 (391.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
I've tried setting dbms.connectors.default_listen_address to 0.0.0.0, the static ip, and commenting it out.
I feel like I might be missing a dependency or something that netty uses to get the MAC address, but the netty site claims no dependencies are required.
The last bit of info is that this is an lxc container, but I swear I have had a version of neo4j running in an lxc in the past.
Additionally this is being flagged as a warning, but it seems to be stopping the bootup.
Any thoughts would be greatly appreciated!
After some work, I have discovered the reason.
The MAC address bit turned out to be a red herring.
The actual cause is using:
neo4j-admin set-initial-password mypass
Anytime I set the initial password this way, neo4j won't start properly.
Unfortunately I do need to figure out a way to set the initial password as this is part of an automated deployment.
Final solution was to not use neo4j-admin and set the password using the web api.
This link shows a good example using curl:
http://430.io/change-neo4j-default-password-in-command-line/
curl -H "Content-Type: application/json" -X POST -d '{"password":"NEW PASSWORD"}' -u neo4j:neo4j http://localhost:7474/user/neo4j/password