btw, I have been fighting for the past few days with the /etc/sysconfig/docker OPTIONS directive.
Anytime I add the -H tcp://0.0.0.0:2375 and start docker, there are the below msgs in journalctl and when I try to run a docker command, I get the response "cannot connect to the Docker daemon. Is the docker daemon running on this host?".
Shutting down firewalld doesn't solve the problem.
I also tried adding the below two commands with firewalld running and it too did not solve the problem.
sudo firewall-cmd --zone=public --add-port=2375/tcp
sudo firewall-cmd --zone-public --add-port=2375/tcp --permanent
Any help would be appreciated. I have docker on a RHEL 7.4 host. Google searches have been inconclusive so far.
MSGS::
Sep 17 16:07:00 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -D OUTPUT -m addrt
Sep 17 16:07:00 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -D PREROUTING' fai
Sep 17 16:07:00 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -D OUTPUT' failed:
Sep 17 16:07:00 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t filter -X DOCKER' fail
Sep 17 16:07:00 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t filter -X DOCKER-ISOLA
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -n -L DOCKER' fail
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t filter -C DOCKER-ISOLA
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -C DOCKER -i docke
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -D FORWARD -i docker0 -o
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -C PREROUTING -m a
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -C OUTPUT -m addrt
Sep 17 16:07:01 qemu-kvm.clt01 dockerd-current[13353]: time="2017-09-17T16:07:01.297529385Z" level=info msg="Default bridg
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -C POSTROUTING -s
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t nat -C DOCKER -i docke
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -D FORWARD -i docker0 -o
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t filter -C FORWARD -i d
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t filter -C FORWARD -i d
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t filter -C FORWARD -o d
Sep 17 16:07:01 qemu-kvm.clt01 firewalld[5293]: WARNING: COMMAND_FAILED: '/usr/sbin/iptables -w2 -t filter -C FORWARD -o d
-Walter H. Schulze III
BA: M.I.S., MA: I.T., CCDA, CCNA: R&S, Linux+ / LPIC-1