Docker Containers Unable to Access Internet (DNS Resolution Fails)

General
,
1

OS : Ubuntu 24.04.1 LTS
Docker version 27.5.1, build 9f9e405
Docker Compose version v2.32.4

Hi Docker Community,

I’m facing an issue where Docker containers on my EC2 instance cannot access the internet, specifically failing to resolve DNS queries. Here’s a summary of the problem and what I’ve tried so far:

  • Containers cannot resolve DNS queries (e.g., nslookup google.com fails with ;; connection timed out; no servers could be reached).
  • The host (EC2 instance) has full internet access and can resolve DNS queries without issues.
  • Docker logs show the following error:
sudo journalctl -u docker.service -n 10

[resolver] failed to query external DNS server: read udp 192.168.1.3:40771->8.8.8.8:53: i/o timeout

###Network Configuration

  • Docker bridge network (docker0) is up but shows state DOWN.
    • /etc/resolv.conf points to 127.0.0.53 (systemd-resolved stub resolver).
    • EC2 security group allows all outbound traffic and inbound traffic on necessary ports (22, 80, 443, etc.).

Steps Taken

  • Overridden Docker’s DNS settings in /etc/docker/daemon.json
{  
  "dns": ["8.8.8.8", "1.1.1.1"]  
}
  • Restarted Docker after making changes.
  • Tested DNS resolution inside containers using busybox and alpine images:
docker run --rm busybox nslookup google.com

Result: ;; connection timed out; no servers could be reached .

  • Temporarily disabled systemd-resolved and manually set /etc/resolv.conf to use 8.8.8.8
  • Verified that the host can ping 8.8.8.8 and resolve google.com.

Additional Note

When using --network host , containers can access the internet. For example:

docker run --rm --network host ubuntu:latest apt-get update

This works without issues, indicating that the problem is specific to Docker’s default bridge network.

Current Observations

  • The Docker bridge network (docker0) is up but shows state DOWN.
  • Containers can’t reach external DNS servers, even though the host can.
  • Firewall rules (iptables/security groups) seem correct, as outbound traffic is allowed.

I also tried to completely re-install docker, but it didn’t help Ubuntu | Docker Docs

One more note.
This issue appeared only on the new instance with the image of the original server. It worked on the prev instance

container inspect

[
    {
        "Id": "7b1dc81b2de4f51b8399be34ef3ccdba374ae22c973f822fad45e4f4e988f8c0",
        "Created": "2025-01-30T09:20:01.292568915Z",
        "Path": "docker-entrypoint.sh",
        "Args": [
            "apache2-foreground"
        ],
        "State": {
            "Status": "running",
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 265168,
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2025-01-30T09:20:01.62189457Z",
            "FinishedAt": "0001-01-01T00:00:00Z"
        },
        "Image": "sha256:3808feae36685045e9190f6e0227bdf73bb965e83f2df099f37df331c2344652",
        "ResolvConfPath": "/var/lib/docker/containers/7b1dc81b2de4f51b8399be34ef3ccdba374ae22c973f822fad45e4f4e988f8c0/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/7b1dc81b2de4f51b8399be34ef3ccdba374ae22c973f822fad45e4f4e988f8c0/hostname",
        "HostsPath": "/var/lib/docker/containers/7b1dc81b2de4f51b8399be34ef3ccdba374ae22c973f822fad45e4f4e988f8c0/hosts",
        "LogPath": "/var/lib/docker/containers/7b1dc81b2de4f51b8399be34ef3ccdba374ae22c973f822fad45e4f4e988f8c0/7b1dc81b2de4f51b8399be34ef3ccdba374ae22c973f822fad45e4f4e988f8c0-json.log",
        "Name": "/wordpress",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "docker-default",
        "ExecIDs": null,
        "HostConfig": {
            "Binds": [
                "/var/www/blog/wordpress:/var/www/html:rw",
                "/var/www/blog/uploads.ini:/usr/local/etc/php/conf.d/uploads.ini:rw"
            ],
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "blog_default",
            "PortBindings": {
                "80/tcp": [
                    {
                        "HostIp": "",
                        "HostPort": "8080"
                    }
                ]
            },
            "RestartPolicy": {
                "Name": "always",
                "MaximumRetryCount": 0
            },
            "AutoRemove": false,
            "VolumeDriver": "",
            "VolumesFrom": null,
            "ConsoleSize": [
                0,
                0
            ],
            "CapAdd": null,
            "CapDrop": null,
            "CgroupnsMode": "private",
            "Dns": null,
            "DnsOptions": null,
            "DnsSearch": null,
            "ExtraHosts": [],
            "GroupAdd": null,
            "IpcMode": "private",
            "Cgroup": "",
            "Links": null,
            "OomScoreAdj": 0,
            "PidMode": "",
            "Privileged": false,
            "PublishAllPorts": false,
            "ReadonlyRootfs": false,
            "SecurityOpt": null,
            "UTSMode": "",
            "UsernsMode": "",
            "ShmSize": 67108864,
            "Runtime": "runc",
            "Isolation": "",
            "CpuShares": 0,
            "Memory": 0,
            "NanoCpus": 0,
            "CgroupParent": "",
            "BlkioWeight": 0,
            "BlkioWeightDevice": null,
            "BlkioDeviceReadBps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteIOps": null,
            "CpuPeriod": 0,
            "CpuQuota": 0,
            "CpuRealtimePeriod": 0,
            "CpuRealtimeRuntime": 0,
            "CpusetCpus": "",
            "CpusetMems": "",
            "Devices": null,
            "DeviceCgroupRules": null,
            "DeviceRequests": null,
            "MemoryReservation": 0,
            "MemorySwap": 0,
            "MemorySwappiness": null,
            "OomKillDisable": null,
            "PidsLimit": null,
            "Ulimits": null,
            "CpuCount": 0,
            "CpuPercent": 0,
            "IOMaximumIOps": 0,
            "IOMaximumBandwidth": 0,
            "MaskedPaths": [
                "/proc/asound",
                "/proc/acpi",
                "/proc/kcore",
                "/proc/keys",
                "/proc/latency_stats",
                "/proc/timer_list",
                "/proc/timer_stats",
                "/proc/sched_debug",
                "/proc/scsi",
                "/sys/firmware",
                "/sys/devices/virtual/powercap"
            ],
            "ReadonlyPaths": [
                "/proc/bus",
                "/proc/fs",
                "/proc/irq",
                "/proc/sys",
                "/proc/sysrq-trigger"
            ]
        },
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/974d9cf9c2478d16870241ca8ad73c9bc3e2bc3207e7e390df444ef26bd78433-init/diff:/var/lib/docker/overlay2/c7388714dffb416a1f68011f2e0be0061feac8527ef000e146e41c91765fac3c/diff:/var/lib/docker/overlay2/00239a7f0f4de4e5f7ea9603fb2f3bcb60607a005124d1e345bb94e01696a340/diff:/var/lib/docker/overlay2/654f477a272d1e17e099857050e731b7583c721cfa6d26fed4ebbb026b8ba95e/diff:/var/lib/docker/overlay2/3f2ea21869b9993961d5a21b6fa4cc513760692244bb7dcb4c1b3c3e9ae1bd11/diff:/var/lib/docker/overlay2/ca70e77c8a7f0bb9dd4ce1f6f2b24505611ed2b122e742f1b9ea1cfb06685324/diff:/var/lib/docker/overlay2/bcc412b1275003179059d1b4a54cc56386c1bcf455438aaa6963eed6a5c42f1e/diff:/var/lib/docker/overlay2/a7c699df9cebb173c5397fb77024684e69077673d02ed2695ca4deab8b0095d6/diff:/var/lib/docker/overlay2/2724fe6b185866428f347bfea9880fd4d620db43d40e6a013fb12f390f424f8c/diff:/var/lib/docker/overlay2/af43f5d4c8328ec483369584a0c8d20e87395ec3542b435853e4e6d000de89dd/diff:/var/lib/docker/overlay2/ce8e25cbc18ed8e3bb1f716902cdc06dbc114197fd1746b4f1166259b5eac8fb/diff:/var/lib/docker/overlay2/dcf608ac7b56a795c08e3ccee358d8c0e721e1822f67cf23d989be29cd4170f8/diff:/var/lib/docker/overlay2/f1c30e89817436bb693fde627d9339c4b5f15f5b531fb3a99242f4f3a0c4fa90/diff:/var/lib/docker/overlay2/b312fa139575080a48e8e38b5e7bdf2cb943d8bf3d270fab8ed3dd5b2e4b7f12/diff:/var/lib/docker/overlay2/12b1dcfe523a247bbb1a1fb9ac50909ac4a2e26120963e91c486d8bb5e81837c/diff:/var/lib/docker/overlay2/57f3755a999e063441749161e228c8f8207ba07cf47d474fb3c34ad16c336378/diff:/var/lib/docker/overlay2/054a3859518181cadfe77236f08c16f724c7228a390d27b8c9d78eaf3a29421c/diff:/var/lib/docker/overlay2/d2667ae12a453bbf8965ef71620d71dc3c8a57daba4b676db2be6a58e6e18ff7/diff:/var/lib/docker/overlay2/2c59f3b99a132950e5477f137656f208dec7de0c1d7247ec3dd1ca46141129be/diff:/var/lib/docker/overlay2/f223a44dd994f3b0290892497dccb55d4ddf560a459d5d3ac83e7f9cc83b7e51/diff:/var/lib/docker/overlay2/2525ff7094b55e8e3dd6f05fcabde091d2d6cc5d9e64910432e2d18db6cacbfa/diff:/var/lib/docker/overlay2/1b57a893f93c013c053554ec105bb4cd2574c9955e88c99690764e87bd7a8289/diff:/var/lib/docker/overlay2/97ffa1594afefca1d06f82f1ad1839a2f25497d82cef64f9f16dfa5db72c604a/diff",
                "MergedDir": "/var/lib/docker/overlay2/974d9cf9c2478d16870241ca8ad73c9bc3e2bc3207e7e390df444ef26bd78433/merged",
                "UpperDir": "/var/lib/docker/overlay2/974d9cf9c2478d16870241ca8ad73c9bc3e2bc3207e7e390df444ef26bd78433/diff",
                "WorkDir": "/var/lib/docker/overlay2/974d9cf9c2478d16870241ca8ad73c9bc3e2bc3207e7e390df444ef26bd78433/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [
            {
                "Type": "bind",
                "Source": "/var/www/blog/wordpress",
                "Destination": "/var/www/html",
                "Mode": "rw",
                "RW": true,
                "Propagation": "rprivate"
            },
            {
                "Type": "bind",
                "Source": "/var/www/blog/uploads.ini",
                "Destination": "/usr/local/etc/php/conf.d/uploads.ini",
                "Mode": "rw",
                "RW": true,
                "Propagation": "rprivate"
            }
        ],
        "Config": {
            "Hostname": "7b1dc81b2de4",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": true,
            "AttachStderr": true,
            "ExposedPorts": {
                "80/tcp": {}
            },
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "WORDPRESS_DB_HOST=db",
                "WORDPRESS_DB_USER=sfo_user",
                "WORDPRESS_DB_PASSWORD=1zaPSq71Mcy9",
                "UPLOAD_LIMIT=128M",
                "WORDPRESS_DB_NAME=sfo_db",
                "WORDPRESS_TABLE_PREFIX=wp_",
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "PHPIZE_DEPS=autoconf \t\tdpkg-dev \t\tfile \t\tg++ \t\tgcc \t\tlibc-dev \t\tmake \t\tpkg-config \t\tre2c",
                "PHP_INI_DIR=/usr/local/etc/php",
                "APACHE_CONFDIR=/etc/apache2",
                "APACHE_ENVVARS=/etc/apache2/envvars",
                "PHP_CFLAGS=-fstack-protector-strong -fpic -fpie -O2 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64",
                "PHP_CPPFLAGS=-fstack-protector-strong -fpic -fpie -O2 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64",
                "PHP_LDFLAGS=-Wl,-O1 -pie",
                "GPG_KEYS=39B641343D8C104B2B146DC3F9C39DC0B9698544 E60913E4DF209907D8E30D96659A97C9CF2A795A 1198C0117593497A5EC5C199286AF1F9897469DC",
                "PHP_VERSION=8.2.27",
                "PHP_URL=https://www.php.net/distributions/php-8.2.27.tar.xz",
                "PHP_ASC_URL=https://www.php.net/distributions/php-8.2.27.tar.xz.asc",
                "PHP_SHA256=3eec91294d8c09b3df80b39ec36d574ed9b05de4c8afcb25fa215d48f9ecbc6b"
            ],
            "Cmd": [
                "apache2-foreground"
            ],
            "Image": "wordpress:latest",
            "Volumes": {
                "/var/www/html": {}
            },
            "WorkingDir": "/var/www/html",
            "Entrypoint": [
                "docker-entrypoint.sh"
            ],
            "OnBuild": null,
            "Labels": {
                "com.docker.compose.config-hash": "c4a9f680dc6569e03ca547b7cdffa7d105d97cc8020fa9c5f4c9538e794cb446",
                "com.docker.compose.container-number": "1",
                "com.docker.compose.depends_on": "db:service_started:false",
                "com.docker.compose.image": "sha256:3808feae36685045e9190f6e0227bdf73bb965e83f2df099f37df331c2344652",
                "com.docker.compose.oneoff": "False",
                "com.docker.compose.project": "blog",
                "com.docker.compose.project.config_files": "/var/www/blog/docker-compose.yml",
                "com.docker.compose.project.working_dir": "/var/www/blog",
                "com.docker.compose.service": "wordpress",
                "com.docker.compose.version": "2.32.4"
            },
            "StopSignal": "SIGWINCH"
        },
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "40b139519029413418cd503699de80aa1b8063fe4ee4f57f4f9112f7701ba429",
            "SandboxKey": "/var/run/docker/netns/40b139519029",
            "Ports": {
                "80/tcp": [
                    {
                        "HostIp": "0.0.0.0",
                        "HostPort": "8080"
                    },
                    {
                        "HostIp": "::",
                        "HostPort": "8080"
                    }
                ]
            },
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "",
            "Gateway": "",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "",
            "IPPrefixLen": 0,
            "IPv6Gateway": "",
            "MacAddress": "",
            "Networks": {
                "blog_default": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": [
                        "wordpress",
                        "wordpress"
                    ],
                    "MacAddress": "02:42:ac:13:00:03",
                    "DriverOpts": null,
                    "NetworkID": "6f76250566bae0e58d9bf08545efcfc14070be2d6c49c99733b3fa4bf1a3f8f5",
                    "EndpointID": "ec9fb5aa1077ca32613089ed900a9070d2dcd89040eca0bf7e06e3c99d62ee0a",
                    "Gateway": "172.19.0.1",
                    "IPAddress": "172.19.0.3",
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "DNSNames": [
                        "wordpress",
                        "7b1dc81b2de4"
                    ]
                }
            }
        }
    }
]

and

docker network inspect blog_default

[
    {
        "Name": "blog_default",
        "Id": "6f76250566bae0e58d9bf08545efcfc14070be2d6c49c99733b3fa4bf1a3f8f5",
        "Created": "2025-01-29T13:49:07.773622003Z",
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": false,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.19.0.0/16",
                    "Gateway": "172.19.0.1"
                }
            ]
        },
        "Internal": false,
        "Attachable": false,
        "Ingress": false,
        "ConfigFrom": {
            "Network": ""
        },
        "ConfigOnly": false,
        "Containers": {
            "7b1dc81b2de4f51b8399be34ef3ccdba374ae22c973f822fad45e4f4e988f8c0": {
                "Name": "wordpress",
                "EndpointID": "ec9fb5aa1077ca32613089ed900a9070d2dcd89040eca0bf7e06e3c99d62ee0a",
                "MacAddress": "02:42:ac:13:00:03",
                "IPv4Address": "172.19.0.3/16",
                "IPv6Address": ""
            },
            "a119a0b89003973984e66850c789df999a284e173434fec7fc8ebc71ec1ff496": {
                "Name": "db",
                "EndpointID": "0f0b5f72a73fb94b227db3176bfc4d2eb224931f96267e18070b7863c70c858f",
                "MacAddress": "02:42:ac:13:00:02",
                "IPv4Address": "172.19.0.2/16",
                "IPv6Address": ""
            }
        },
        "Options": {},
        "Labels": {
            "com.docker.compose.config-hash": "390eeb02a9464f3c587891f28664e31cee5e31a8f21d51ef50ab4c49a17caca6",
            "com.docker.compose.network": "default",
            "com.docker.compose.project": "blog",
            "com.docker.compose.version": "2.32.4"
        }
    }
]
2

Share docker info.

3

It’s the same on my swarm hosts, but works regardless:

me@swarm1:~$ ip a | grep docker0
5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    inet 172.17.0.1/16 brd 172.17.255.255 scope global docker0

me@swarm1:~$ ping -c 3 172.17.0.1
PING 172.17.0.1 (172.17.0.1) 56(84) bytes of data.
64 bytes from 172.17.0.1: icmp_seq=1 ttl=64 time=0.019 ms
64 bytes from 172.17.0.1: icmp_seq=2 ttl=64 time=0.014 ms
64 bytes from 172.17.0.1: icmp_seq=3 ttl=64 time=0.014 ms

--- 172.17.0.1 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2051ms
rtt min/avg/max/mdev = 0.014/0.015/0.019/0.002 ms

me@swarm1:~$ sudo docker run -ti --rm alpine nslookup google.com
Unable to find image 'alpine:latest' locally
latest: Pulling from library/alpine
1f3e46996e29: Pull complete
Digest: sha256:56fa17d2a7e7f168a043a2712e63aed1f8543aeafdcee47c58dcffe38ed51099
Status: Downloaded newer image for alpine:latest
Server:         192.168.200.1
Address:        192.168.200.1:53

Non-authoritative answer:
Name:   google.com
Address: 74.125.206.113
Name:   google.com
Address: 74.125.206.100
Name:   google.com
Address: 74.125.206.102
Name:   google.com
Address: 74.125.206.138
Name:   google.com
Address: 74.125.206.101
Name:   google.com
Address: 74.125.206.139

Non-authoritative answer:
Name:   google.com
Address: 2a00:1450:400c:c0b::65
Name:   google.com
Address: 2a00:1450:400c:c0b::64
Name:   google.com
Address: 2a00:1450:400c:c0b::71
Name:   google.com
Address: 2a00:1450:400c:c0b::66

A possible workaround could be to switch back to legacy iptables:

sudo update-alternatives --set iptables /usr/sbin/iptables-legacy
sudo update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
4

Hello @bluepuma77 , here is my docker info

Client: Docker Engine - Community
 Version:    27.5.1
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.20.0
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.32.4
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 4
  Running: 3
  Paused: 0
  Stopped: 1
 Images: 5
 Server Version: 27.5.1
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 Swarm: inactive
 Runtimes: runc io.containerd.runc.v2
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: bcc810d6b9066471b0b6fa75f557a15a1cbf31bb
 runc version: v1.2.4-0-g6c52b3f
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.8.0-1021-aws
 Operating System: Ubuntu 24.04.1 LTS
 OSType: linux
 Architecture: aarch64
 CPUs: 2
 Total Memory: 7.627GiB
 Name: ip-172-31-22-152
 ID: ce08846a-2d9f-42a4-b481-c97db96c3e38
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false
5

Hello @meyay
THank you for your support
I’ve just tried to switch back to legacy, but unfortunately it didn’t help

6

Here is output of iptables -L -n

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
DOCKER-USER  0    --  0.0.0.0/0            0.0.0.0/0           
DOCKER-ISOLATION-STAGE-1  0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
DOCKER     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
DOCKER     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
DOCKER     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
DOCKER     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0           
ACCEPT     0    --  0.0.0.0/0            0.0.0.0/0           

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain DOCKER (4 references)
target     prot opt source               destination         
ACCEPT     6    --  0.0.0.0/0            172.18.0.2           tcp dpt:8000
ACCEPT     6    --  0.0.0.0/0            172.19.0.3           tcp dpt:80

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
target     prot opt source               destination         
DOCKER-ISOLATION-STAGE-2  0    --  0.0.0.0/0            0.0.0.0/0           
DOCKER-ISOLATION-STAGE-2  0    --  0.0.0.0/0            0.0.0.0/0           
DOCKER-ISOLATION-STAGE-2  0    --  0.0.0.0/0            0.0.0.0/0           
DOCKER-ISOLATION-STAGE-2  0    --  0.0.0.0/0            0.0.0.0/0           
RETURN     0    --  0.0.0.0/0            0.0.0.0/0           

Chain DOCKER-ISOLATION-STAGE-2 (4 references)
target     prot opt source               destination         
DROP       0    --  0.0.0.0/0            0.0.0.0/0           
DROP       0    --  0.0.0.0/0            0.0.0.0/0           
DROP       0    --  0.0.0.0/0            0.0.0.0/0           
DROP       0    --  0.0.0.0/0            0.0.0.0/0           
RETURN     0    --  0.0.0.0/0            0.0.0.0/0           

Chain DOCKER-USER (1 references)
target     prot opt source               destination         
RETURN     0    --  0.0.0.0/0            0.0.0.0/0
7

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