Check user1' s sudo permissions:A traffic capture from the docker host on the virtual interface (veth-) will show all traffic the container is sending on a particular subnet. Then set user to user1: su - user1. Then inside the container, set up a user, user1, and added it to the sudo group: adduser user1 adduser user1 sudo. Then in the container set up iptables & sudo: apt update -y apt-get install iptables sudo -y. Docker run -cap-addNETADMIN -it ubuntu:16.04.TCP and UDP port 7946 for communication among nodes (container network discovery). It only needs to be opened on manager nodes. This port is used for communication between the nodes of a Docker Swarm or cluster. Docker Machine is used to orchestrate Docker hosts. This port is required for Docker Machine to work. TCP port 2376 for secure Docker client communication.While this tutorial covers three methods, each one delivers the same outcome, so you can choose the one you are most familiar with. UFW is the default firewall application on Ubuntu distributions, including Ubuntu 16.04. Those firewall management applications are FirewallD, IPTables Tools, and UFW, the Uncomplicated Firewall.
Docker Iptables Install Iptables SudoFollow this guide to learn more about using UFW on Ubuntu 16.04.Execute the following commands on the nodes that will function as Swarm managers:If UFW isn’t enabled, do so with the following command:This might not be necessary, but it never hurts to restart the Docker daemon anytime you make changes to and restart the firewall: systemctl restart dockerThen on each node that will function as a worker, execute the following commands:Then restart the Docker daemon: systemctl restart dockerThat’s all you need to do to open the necessary ports for Docker Swarm using UFW. You just need to enable and configure it. Method 1 — Opening Docker Swarm Ports Using UFWIf you just set up your Docker hosts, UFW is already installed. That’s because it’s assumed that you’re logged into the server using the docker-machine ssh command after provisioning it using Docker Machine. You can follow the tutorial How To Provision and Manage Remote Docker Hosts with Docker Machine on Ubuntu 16.04 to set these up.Note: You’ll notice that the commands (and all the commands in this article) are not prefixed with sudo. Set up the hosts that make up your cluster, including at least one swarm manager and one swarm worker. firewall-cmd -add-port=7946/udp -permanent firewall-cmd -add-port=7946/tcp -permanent firewall-cmd -add-port=2377/tcp -permanent firewall-cmd -add-port=2376/tcp -permanent firewall-cmd -add-port=22/tcp -permanent But FirewallD is also available on other Linux distributions, including Ubuntu 16.04.If you opt to use FirewallD instead of UFW, first uninstall UFW:Then enable it so that it starts on boot:On the node that will be a Swarm manager, use the following commands to open the necessary ports: iptables -A INPUT -p tcp -dport 2376 -j ACCEPT iptables -A INPUT -p tcp -dport 22 -j ACCEPT This first set of command should be executed on the nodes that will serve as Swarm managers. If you’re switching from FirewallD or UFW, first uninstall them.Then install the iptables-persistent package, which manages the automatic loading of IPtables rules:Next, flush any existing rules using this command:Now you can add rules using the iptables utility. Method 3 — Opening Docker Swarm Ports Using IPTablesTo use IPtables on any Linux distribution, you’ll have to first uninstall any other firewall utilities. Systemctl restart dockerYou’ve successfully used FirewallD to open the necessary ports for Docker Swarm. ConclusionFirewallD, IPTables Tools and UFW are the three firewall management applications in the Linux world. You can learn more about how these rules work in the tutorial How the Iptables Firewall Works.If you wish to switch to FirewallD or UFW after using this method, the proper way to go about it is to first stop the firewall:Finally, save the now empty tables to disk:Then you can switch to UFW or FirewallD. iptables -A INPUT -p udp -dport 4789 -j ACCEPTAfter you enter all of the commands, save the rules to disk:On the nodes that will function as Swarm workers, execute these commands:That’s all it takes to open the necessary ports for Docker Swarm using IPTables. iptables -A INPUT -p udp -dport 7946 -j ACCEPT iptables -A INPUT -p tcp -dport 7946 -j ACCEPT Anghami app for macWhich method you use is just a matter of personal preference, as they are all equally capable.
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