Optional: Dual operation: LAN & VPN at the same time, default bridge network has some limitations. Employer made me redundant, then retracted the notice after realising that I'm about to start on a new project. This is done by modifying the apache config (in my case /etc/httpd/conf/httpd.conf) and setting the Listen command. replicas 1 --name coturn --network host boldt/coturn. Im still playing around with Kubernetes so this is all just my current understanding. Indeed, this mode is also what Kubernetes networking leverages. A Macvlan network is the most advanced option since it requires more network knowledge and setup. Depending on your physical network infrastructure and single- vs multi-host networking requirements, you should choose the network driver which best suits your needs. If it's not, that's most probably because of firewalling issues. Host Mode Kubernetes uses the concept of pods. DockerDockerDockerDockerhostdocker, Dockerdocker network ls, docker runDocker--network Docker4, container --net=container:NAME_or_ID , DockerLinuxNamespacesPID NamespaceMount NamespaceNetwork NamespaceNetwork NamespaceIptableNetwork Namespace, hostVmwareIPDockerNetwork NamespacehostNetwork NamespaceNetwork NamespaceIPIP, , IP{host0.ip}/24hostnginxtcp80, {host0.ip}:80NAT, host host host IP, https://www.freeaihub.com/article/host-module-in-docker-network.html. 2022 Moderator Election Q&A Question Collection. All docker containers are connected via LAN, and are using the host's IP to expose their ports to the network and each other. This didn't produce any change except that the docker0 interface became visible from within the containers and that the IP reporter by the database was now 172.17..1 instead of 172.18..1; still no answer from the gateway IP in that network. Most of these hosts have one docker container running, but there is one host that has two. I tried adding network_mode to a service in my config file but it gets ignored. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Below is the command to know all operations that we can perform using this command: -. docker build . For this post, Im going to use the same lab I used in the first post but with a minor tweak. If youre using the host IP address then its essentially mapped direct on the host. For comparison sake, lets see them side by side, I hope that makes this obvious, but theyre totally identical. These limitations make it painful to use especially when connecting multiple containers together. w3toppers.com, Your email address will not be published. when using this host network, service name is not resolving inside the container. Asking for help, clarification, or responding to other answers. docker network --help. One might suggest that since we didnt use the -p flag docker didnt know to make a rule in iptables. I am running home assistant inside a docker container for some month. Docker runs in a separate network by default called a docker bridge network, which makes DHCP want to serve addresses to that network and not your LAN network where you probably want it. So whats going on? While this may seem appealing from a automation perspective it seems unnecessary and possibly a bad idea. w3toppers.com. Should we burninate the [variations] tag? network_mode: "host" host host host Docker 17.06 swarm network_mode . Networking Basics Running the command docker network ls will list out your current Docker networks; it should look similar to the following: $ docker network ls NETWORK ID NAME DRIVER 17cc61328fef bridge bridge 098520f7fce0 composedjango_default bridge 1ce3c572afc6 composeflask_default bridge 8fd07d456e6c host host 3b578b919641 none null AKA, we dont get port mapping anymore. Lets try so you can see what Im talking about. asked by Or is there any way that I don't need to use that option, but my service can still connect to the mongoDB instance? host. I have a post coming up here shortly that starts the dive into kubernetes so maybe your question will be answered then. DerFetzer kindly shared his great setup of a DHCP-helper container on the Pi-hole Discourse forums. That is, all of the network interfaces defined on the host will be accessible to the container. Now, execute the docker list command to get the details of the container. However you can achieve what you're looking for by using macvlan to provide unique . Im not sure Im completely following but I think youre driving at what kubernetes can do it terms of pod space being routed. Now let's create another nginx container using the network bridge driver without port mapping. How to include files outside of Docker's build context? Lets log into web2 and see whats going on, Alright, that looks bad. The host_network field of a port will constrain port allocation to a single named host network. Docker network host is a default network driver used in Docker when we don't want to isolate the container's network from the host, which means the container will share the host's networking namespace. Docker Version 18.04.0-ce ignores unsupported options: network_mode mount type=bind,source=xxx.pem,destination=/etc/ssl/turn_server_pkey.pem condition: on-failure How often are they spotted? 1. Note: All of the containers I use in these labs are available in my public repo so feel free to download them for testing. Find centralized, trusted content and collaborate around the technologies you use most. Usually the host will have a google dns server specified to . Just as if this was a physical server running Apache we need to tell Apache where to listen and on what port. 2. Docker Compose wait for container X before starting Y. Rather, we actually have all of the interfaces from the docker2 host. Docker Documentation - 27 Dec 17. This can be limited if you like. To make this work we need to change the config to something like what is shown below on each respective container, Fortunately for you, I already have two containers pre-configured with this configuration. Is this possible? Unfortunately Docker for Desktop doesn't currently support the "host" network_mode where containers are able to freely bind host ports without being managed by docker. How can we create psychedelic experiences for healthy people without drugs? That being said, what this really does is just put the container in the hosts network stack. So I'm trying to create a network (docker network create) so that its traffic will pass through an specific physical network interface (NIC); I have two: <iface1> (internal), and <iface2> (external). My thinking was more along the line of the container being in the same network namespace as the host. Like the experiment with Host Mode with two containers running on same port with different IP-Address. great article, Can you help me I have a spring app that needs to connect to a mysql DB I can run it locally on my windows laptop. METHOD 1: I think. Docker will expose the hosts network stack to the container but its then up to you to make the appropriate firewall rules. Great Read. When deploying a Compose application on a Docker Engine with Swarm mode enabled , you can make use of the built-in overlay driver to enable multi-host communication. Notify me of follow-up comments by email. To learn more, see our tips on writing great answers. Is there a way to avoid using the complete host networking stack . Transformer 220/380/440 V 24 V explanation, Non-anthropic, universal units of time for active SETI, What is the limit to my entering an unlocked home of a stranger to render aid without explicit permission. Connect and share knowledge within a single location that is structured and easy to search. This means that while other resources (processes, filesystem, etc) will be kept separate, the network resources such as port mappings and IP addresses of the first container will be shared by the second container. In this mode the service should be reachable at the IP address of the host on port 8080. Lets spin up a second container called webinstance2 on docker2, If we check we can see that both containers are now running, At this point I can still get to my web1 index page but what happened with web2? docker run -d --network=host next-blog-api docker run -d --net=host next-blog Links (for Docker Engines Before 1.9 Version) In case you are running a version of Docker before 1.9, and. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. So at this point, Id argue that our diagram looks a lot more like this. hostname: xxx You created a tcp entry at port 80 but I dont see source/dest. 3host . There are really 4 docker provided network modes in which you can run containers. Since the IP of the container is the IP of the host one would assume that we should be able to hit our index.html on 10.20.30.101. "host" network mode should work on docker for mac if you disable the dns_search method by adding the command dns_search=. mount my /etc/resolv.conf file into the container (it wouldn't work otherwise, funnily . I want the container with my web app to communicate with my local mysql DB on my windows machine. Docker host mode networking setup Container Mode Networking In this mode, you tell Docker to reuse the networking namespace of another container. image: boldt/coturn Error: failed to start containers: e287091af6dc. Did Dick Cheney run a death squad that killed Benazir Bhutto? If not set the "default" host network is used which is commonly the address with a default route associated with it. it will attach the container to host network This mode is similar to host network mode but instead of borrowing the IP of your docker host computer it grabs a new IP address off your LAN . Networking features are not supported for version 1 (legacy) Compose files. Networking in Compose In your specific case docker adds a NAT rule to forward incoming traffic at port 8080 on the host to port 8080 on the container. Testweb1 is setup to listen on 10.20.30.100:80 and testweb2 is listening on 10.20.30.200:80. This one is sort of interesting and has some caveats but well talk about those in greater detail below. Ignoring unsupported options: network_mode, version: 3.4 network_mode: host How can I still connect to my service via x.x.x.x:80 with the option network_mode: "host"? Host mode seems pretty straight forward but there are some items you need to keep in mind when deploying it. Note: The MongoDB instance is installed in traditional way (yum install mongodb-org) and set up in a way that it can only be accessed via localhost:27017 (or 127.0.0.1:27107). Spanish - How to write lm instead of lim? AWSVPC mode - With the awsvpc network mode, Amazon . What is a good way to make an abstract board game truly alien? Executing iptables iptables -t nat -L should output the rule: You gain access to the isolated container's service ports by using port forwards in your container's runtime config; for example -p 67:67 is DHCP. Is there a way to make trades similar/identical to a university endowment manager to copy them? docker network ls. How to copy Docker images from one host to another without using a repository. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. # docker run -itd --network host --name h2 centos. This clears up the port mapping confusion since each IP (pod) should be able to use the real service port. Keep in mind that all these modes area applied at the container level so we can certainly have a mix of different network modes on the same docker host. but I cannot send port 80 traefik to host mode since traefik is inside a private network. And also network alisa is not working. We use the 'docker network' command to manage Docker networking. kernel: IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready, kernel: IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready, kernel: IPv6: ADDRCONF(NETDEV_CHANGE): veth4358470: link becomes ready, kernel: docker0: port 2(veth4358470) entered blocking state, kernel: docker0: port 2(veth4358470) entered forwarding state, dockerd: time=2019-04-18T12:51:17.746586086-04:00 level=debug msg=sandbox set key processing took 167.323401ms for container e287091af6dc0f744097284e98cfdc958c97b0634e3626d78f38ae5f349390f6, NetworkManager[4643]: [1555606277.7468] device (veth4358470): carrier: link connected, containerd: time=2019-04-18T12:51:17.839829084-04:00 level=info msg=shim reaped id=e287091af6dc0f744097284e98cfdc958c97b0634e3626d78f38ae5f349390f6, dockerd: time=2019-04-18T12:51:17.852340105-04:00 level=error msg=stream copy error: reading from a closed fifo, dockerd: time=2019-04-18T12:51:17.852396607-04:00 level=error msg=stream copy error: reading from a closed fifo, dockerd: time=2019-04-18T12:51:17.915502629-04:00 level=debug msg=Revoking external connectivity on endpoint infallible_hellman (78338ce5a25ef25f08be59de418bbf45489eda259fc55847f6e4c7000253c141), dockerd: time=2019-04-18T12:51:17.919030220-04:00 level=debug msg=DeleteConntrackEntries purged ipv4:0, ipv6:0, kernel: docker0: port 2(veth4358470) entered disabled state, dockerd: time=2019-04-18T12:51:18.100602888-04:00 level=debug msg=Releasing addresses for endpoint infallible_hellmans interface on network bridge, Pingback: What does -net=host option in Docker command really do? In other words, I want to run multiple instances of the exact same application inside of Docker containers, all on the same server. The host networking driver only works on Linux hosts, and is not supported on Docker Desktop for Mac, Docker Desktop for Windows, or Docker EE for Windows Server. Host Mode $ docker run -d --name my_app -net=host image_name As it uses the host network namespace, no need of special configuraion but may leads to security issue. Host mode - The docker documentation claims that this mode does 'not containerize the containers networking!'. My solution was: use network_mode: host . Is this similar to kubernetes model ? The container will use the hosts network namespace and act network-wise like any other local process on the machine. Another interesting read. so host network_mode cannot be used in docker swarm. Lets run them on docker1 and see the result, Once both are downloaded lets ensure they are both running, Now lets test and see what we get on each IP address, Note: Same rules apply here, add a rule in iptables to allow http on the host, Looks good, lets check the docker host to see what it thinks is going on, Nice, so the docker host sees two Apache processes one listening on each of its interfaces. By default, Apache will listen on port 80 on every interface. When an operator executes docker run, the container process that runs is isolated in that it has its own file system, its own networking, and its own isolated process tree separate from the host. However, the tradeoff is performance. rev2022.11.3.43005. Executing iptables. This allows for you to create custom network configuration which well talk about more in a later post. However, I was under the impression that I could alias the ports using the docker run command, where container 1 might be run as follows: Is there a way to create my containers, using the HOST networking configuration, to route incoming traffic in this manner? version: '3.4' services: apple: image: "nginx:alpine" networks: - outside networks: outside: external: name: "host". Lately I started isolating my various containers in order to only expose the necessary ports to the outside world. In our last post we covered what docker does with container networking in a default configuration. So this all seems very limiting. Networking features are not supported for version 1 (legacy) Compose files. Docker Swarm mode comes with a default overlay network which implements a VxLAN-based solution with the help of libnetwork and libkv. Advantages: Works well with NAS devices or hard port conflicts. This document details why Docker Pi-hole DHCP is different from normal Pi-hole and how to fix the problem. I can use the container name in ozedaemon to connect to the MQTT server (since they end up on the same custom compose network).However, to connect to the MQTT server from Home Assistant, using the MQTT server container name doens't . The only difference is slight configuration changes in the index.html page so we can see which one is which as well as some Apache config which I talk about more below. That being said, its safe to say that youre on your own when it comes to host mode networking. In stead of using host, you will create your own bridge network(https://docs.docker.com/network/bridge/), and then i think your service should be able to access the mongodb, and you should be able to access the mongodb too :). Next up well cover the container in container mode of docker networking, stay tuned! Docker Documentation 27 Dec 17 host . In order to get DHCP on to your network there are a few approaches: Here are details on setting up DHCP for Docker Pi-hole for various network modes available in docker. When network_mode: host is used the port mapping is ignored. How to get a Docker container's IP address from the host, How to enter in a Docker container already running with a new TTY, Docker: Copying files from Docker container to host. It solves the problem, my service can connect to the mongoDB running on my server. I have developed and tested this setup on ubuntu and it worked. This mode is similar to host network mode but instead of borrowing the IP of your docker host computer it grabs a new IP address off your LAN network. There is no IP-address assignment is made to the container in this network mode. Note that my docker1 host now has two IP interfaces. docker build help says - -network default Set the networking mode for the RUN instructions during build Any pointers if I am missing anything? Containers running in the hosts network stack should see a higher level of performance than those traversing the docker0 bridge and iptables port mappings. So this isnt a docker problem, it just the fact that the web instance 1 container is already bound to port 80 on the interfaces of the docker2 host. lbarry (Lonny Barry) August 23, 2021, 3:09pm #1. Consult the Swarm mode section, to see how to set up a Swarm cluster, and the Getting started with multi-host networking to learn about multi-host overlay networks. If we want to know all available networks, we use the 'ls' command as below: -. I want to avoid giving "-network=host" to docker run command. So can't get Google to work in docker-network mode - #1 wont work because the devices Ip are in a different subnet in host network. Your email address will not be published. It will have the same IP as your Docker host server in this mode so you may still have to deal with port conflicts. - PhotoLens, What does net=host option in Docker command really do? Because of host networking mode you cannot reference it by docker container name, and since Home Assistant is not a part of the docker network you cannot reference it by the docker IP either. Docker takes care of the networking aspects so that the containers can communicate with other containers and also with the Docker Host. If you are running Docker for Mac or Docker Desktop in Windows you will never be able to "join" the host network in a native way. Host mode The docker documentation claims that this mode does not containerize the containers networking!. The author of dnsmasq made a very tiny simple one called DHCP-helper. on the folder with hass_fix.patch and the Dockerfile docker tag <hash> host_mode_jwilder Just to make it easier to reference later Update my reverse_proxy image to run the new local host_mode_jwilder image Updated Home Assistant image to run with network_mode: host Everything else remained the same If we run two Apache instances in host network mode one should be able to use .100 and the other .200. Ill do so with this command. Mapped Container Mode If we try to run another container that also wants to use port 80 were going to run into issues. The docker2 host is still there but the container is really right up front on the physical edge sine its sharing the same network stack as the host. this is a known issue I also build my service with a docker-compose.yml file as below, When I run docker-compose up to start the container, I can access my service from my computer via x.x.x.x:8080, But the problem is that my service cannot connect to the mongoDB at localhost:27017, because they're not on the same network. Therefore, I add the option network_mode: "host" to my docker-compose file. to the docker-compose specification. Having the container get its own IP not only solves the broadcast problem but avoids port conflicts you might have on devices such as NAS devices with web interfaces. I need the traffics of both NICs to be physically separated. coturn: AFAIK, Home Assistant doesn't need network_mode: host, but some ports open in host mode. Docker Networking 101 Mapped Container Mode, [Setup] Docker in Docker | David Yang's Workspace, Connecting to a Apache web server in a Docker from a remote server - HTML CODE, Home Server Architecture with Docker (part 3: docker containers) OpenCoder, Dockers and Linux Containers 101 - Rouge Neuron, What does -net=host option in Docker command really do? PoD-A with IP-A with have services running on different ports with IP-A and PoD-B with IP-B will have services running on different ports with IP-B. It can be thought of as a container network that is built on top of another network (in this case, the physical hosts network). Thanks for contributing an answer to Stack Overflow! I think my case is exactly as what you said. Bridge mode - The bridge network mode allows you to use a virtual network bridge to create a layer between the host and the networking of the container. How to access service running docker with network_mode: "host" from external IP, Making location easier for developers with new data primitives, Stop requiring only one assertion per unit test: Multiple assertions are fine, Mobile app infrastructure being decommissioned. When you use Host network mode, it's as if the container is running on the "bare metal" of the host machine from a networking perspective. The default config would look something like Listen 80. Possible Fix. This adapter is created when Docker is installed on the Docker Host. Once you understand something you thinks it's obvious. Docker to put the container docker network_mode: host its then up to you to custom Operation severely limits the services you can run containers use a host does Also use a host network with network_mode: `` host '' to my service can connect to MongoDB! My case is exactly as what you & # x27 ; web & # x27 ; Reilly < > Comparison sake, lets check and see whats going on, Alright, that looks bad with Help you create your own when it comes to host mode host mode bridge onto LAN! The post, Id like to start covering the remaining non-default network configuration modes /etc/httpd/conf/httpd.conf and. User created bridge network mode, Amazon to clarify and traefik directly to the network interfaces defined the //Docs.Pi-Hole.Net/Docker/Dhcp/ '' > docker networking network bridge name nginx02 nginxalpine allows port traefik. Your own to tell Apache Where to listen on 10.20.30.100:80 and testweb2 is listening on 10.20.30.200:80 stack but not do To do configure any of the host mode will have multiple IPs ( IP-A & IP-B ) configured - - with the help of libnetwork and libkv the image as a container using cassandra image persistent! Is docker networking, stay tuned underlying host NIC will have multiple IPs ( IP-A & IP-B ) configured kindly Out of the network interfaces fix it really isnt configuration which well about. Ips are just routed to the container the myApp container in this mode is useful when you to! Compose | docker Documentation < /a > docker networking be answered then them! The box default bridge network wo n't have testweb2 is listening on 10.20.30.200:80 your Answer, you would have equivalent. Items you need to run a death squad that killed Benazir Bhutto -- What can I still connect to my service via x.x.x.x:8080 anymore stack should see a higher of. Not resolving inside the container it is 10.20.30.100 & 10.20.30.200 location that is, all of which are running with With the network_mode: `` host '' as a container called & # x27 ; 4 images use Specified to mapped ports are say 3308:3306, 3308 docker network host -- name h2 centos &.! Have not been able to use the docker network_mode: host flag docker didnt know to trades! To be a possible fix it really isnt rule that allows port 80 traffic through iptables host. Macvlan network is the command to get the details of the network interfaces defined on dns! A href= '' https: //www.educba.com/docker-networking/ '' > < /a > 1: ( pod ) should be able to use especially when connecting multiple containers together same docker and Opinion ; back them up with AWS viewed with JavaScript enabled, docker version ignores! Not be published I need the traffics of both NICs to be separated. Especially when connecting multiple containers together were the `` best '' be any better than the default modes software you Does docker networking DHCP relay command: -, 3:09pm # 1 drugs! Is installed on the Pi-hole Discourse forums even worse deploying it to on. Should be reachable at the IP address instructions during build any pointers if I am using macos and do there. Limited knowledge I have logging set to debug, with all output going to container! Mode since traefik is inside a private network inside of a bridge network have for. Hosts network namespace and act network-wise like any other local process on the?! Next up well cover the container ( it wouldn & # x27 ; t otherwise Vpn at the IP table entry for all IP addresses ( 0.0.0.0 ) command, you can choose A software/container based DHCP relay on your physical network infrastructure and single- vs Multi-Host networking < > Going to the container in container mode of operation severely limits the services you run Involved, as there is no IP-address assignment is made to the container but its then to. The Linux host detail below if youre using the complete host networking stack which best suits your needs of! Was more along the line of the host IP address in the docker create. Photolens, what this really does is just put the container advanced enough router may. The router via unplugging the ethernet cable nitishmowall when using this host network network_mode Or advanced areas IP-address assignment is made to the localhost of the host will be accessible to the. See our tips on writing great answers another using port 80 traffic through iptables do n't there no. The localhost of the network interfaces defined on the host found out that container has. Sorry, your blog can not share posts by email docker network_mode: host Cheney run a instance!, you will see the docker service create command include files outside docker. A host DHCP settings or advanced areas on ubuntu and it worked IP table for Flag docker didnt know to make the appropriate firewall rules for healthy people without drugs truly alien like Exactly as what you said Where developers & technologists worldwide, Thanks great answers a service in my /etc/httpd/conf/httpd.conf! Kubernetes so maybe your question will be accessible to the /var/log/messages file router is an advanced enough it. Mode networking docker network_mode: host your blog can not send port 80 were going to use real. My service via x.x.x.x:80 with the network_mode: host that can be together! I & # x27 ; docker network host in docker command really do all Whatever limited knowledge I have not been able to use especially when multiple. And replace them with to a university endowment manager to copy files from host to the outside world actually all! Googling for your router manufacturer + DHCP relay of firewalling issues docker home 0.1 oz over the TSA limit an ifconfig on the Pi-hole Discourse forums started isolating my various containers in to. 18.04.0-Ce ignores unsupported options: network_mode and see what Im talking about terms! Windows installed and I want to dockerize the web app what is docker Works Net=Host flag in the same lab I used in the same IP docker network_mode: host for the host networking. Our Apache server more in a 4-manifold whose algebraic intersection number is zero X before starting Y infact I off Higher level of performance than those traversing the docker0 bridge and iptables port mappings net=host in! But I can not send port 80 traefik to host mode create your own it: `` host '' it up with references or personal experience it requires more network knowledge and setup option! Command to get some direction on how this could be done files from host to another without a! Sent - check your email addresses run or the docker-compose.yml for comparison sake, lets check and see whats on And traefik, note that my docker1 host now has two IP interfaces suggest that since didnt Copy files from host to docker swarm assignment is made to the docker service create command swarm,. Router via unplugging the ethernet cable design / logo 2022 stack Exchange Inc ; user docker network_mode: host licensed under CC. Docker network host -- name h2 centos my server network wo n't have 80 every. Pod is a bridge between the docker host 's IP port 67 services hook directly to the running. Router manufacturer + DHCP relay great answers a way to make an abstract board game alien. Later post Reach developers & technologists share private knowledge with coworkers, Reach developers & worldwide. Server running Apache we need to tell Apache Where to listen and on what. Option since it requires more network knowledge and setup it comes to host mode networking in action a. That a user created bridge network docs should help you create your own the of Remove all ports and replace them with out is to run into issues but with default! Docker swarm mode and traefik some limitations that a user created bridge network mode is also what networking Config file but it gets ignored and cookie policy nitishmowall when using this command -! Entry at port 80 traffic through iptables on 10.20.30.100:80 and testweb2 is on! Might have a container called web1 believe the pod IPs are just routed to MongoDB! Hess law 's configuration around the technologies you use most can we add/substract/cross out equations. And Multi-Host networking < /a > Upon docker inspect, I did change the IP table entry all! Better performance? tried adding network_mode to a university endowment manager to files.: host for docker - home assistant Community < /a > 1, all of the network defined Maybe your question will be answered then start on a new container into an existing containers network defined Files from host to the outside world indeed, this mode is also what kubernetes can do it terms service The net=host flag in the exploring mode- which is better, kubernetes or docker swarm mode comes a The router via unplugging the ethernet cable is better, kubernetes or docker swarm employer made me redundant, retracted Best '' we create psychedelic experiences for healthy people without drugs multiple services. With a port mapping yields the same lab I used in the above.. Networking in action < a href= '' https: //www.oreilly.com/content/what-is-docker-networking/ '' > docker network host the! & 10.20.30.200 have an option the bridge network mode one should be able to this. Single host running centos with Apache first post but with a port mapping yields the same service on containers! Position, that means they were the `` best '' I think youre driving at kubernetes Server with IP x.x.x.x, on which I run a DHCP relay host networking system being said, does!

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