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🚀 𝗨𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱𝗶𝗻𝗴 𝗗𝗼𝗰𝗸𝗲𝗿 𝗣𝗼𝗿𝘁 𝗠𝗮𝗽𝗽𝗶𝗻𝗴𝘀🐳

Hey LinkedIn crew! 👋 So, In my yesterday's Docker session one student asked if we can create two docker container of the same image on the same VM i.e; coexistence of two docker container created from same docker image. If so the how we will do the port mapping 🚢

𝟭. 𝗧𝗵𝗲 𝗦𝗲𝘁𝘂𝗽:

Imagine you have a VM with a public IP - let's call it XYZ. On this VM, you want to run two containers from the image 𝗮𝗱𝗶𝗷𝗮𝗶𝘀𝘄𝗮𝗹/𝘀𝗮𝗻𝘁𝗮:𝗹𝗮𝘁𝗲𝘀𝘁.
𝗕𝗼𝘁𝗵 𝗰𝗼𝗻𝘁𝗮𝗶𝗻𝗲𝗿𝘀 𝗲𝘅𝗽𝗼𝘀𝗲 𝘁𝗵𝗲𝗶𝗿 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 𝗼𝗻 𝗽𝗼𝗿𝘁 𝟴𝟬𝟴𝟬, 𝗯𝘂𝘁 𝘆𝗼𝘂 𝘄𝗮𝗻𝘁 𝘁𝗼 𝗮𝗰𝗰𝗲𝘀𝘀 𝘁𝗵𝗲𝗺 𝗲𝘅𝘁𝗲𝗿𝗻𝗮𝗹𝗹𝘆 𝗼𝗻 𝗽𝗼𝗿𝘁𝘀 𝟴𝟬𝟴𝟬 𝗮𝗻𝗱 𝟴𝟬𝟴𝟭.

𝟮. 𝗗𝗼𝗰𝗸𝗲𝗿 𝗥𝘂𝗻 𝗖𝗼𝗺𝗺𝗮𝗻𝗱:
Fire up the terminal and run these magical commands:

# 𝗖𝗼𝗻𝘁𝗮𝗶𝗻𝗲𝗿 𝟭
𝗱𝗼𝗰𝗸𝗲𝗿 𝗿𝘂𝗻 -𝗱 -𝗽 𝟴𝟬𝟴𝟬:𝟴𝟬𝟴𝟬 𝗮𝗱𝗶𝗷𝗮𝗶𝘀𝘄𝗮𝗹/𝘀𝗮𝗻𝘁𝗮:𝗹𝗮𝘁𝗲𝘀𝘁

# 𝗖𝗼𝗻𝘁𝗮𝗶𝗻𝗲𝗿 𝟮
𝗱𝗼𝗰𝗸𝗲𝗿 𝗿𝘂𝗻 -𝗱 -𝗽 𝟴𝟬𝟴𝟭:𝟴𝟬𝟴𝟬 𝗮𝗱𝗶𝗷𝗮𝗶𝘀𝘄𝗮𝗹/𝘀𝗮𝗻𝘁𝗮:𝗹𝗮𝘁𝗲𝘀𝘁

𝟯. 𝗪𝗵𝗮𝘁'𝘀 𝗛𝗮𝗽𝗽𝗲𝗻𝗶𝗻𝗴? 🤔

-d: Runs containers in the background.
-p 8080:8080 and -p 8081:8080: Maps the container's port 8080 to the host's ports 8080 and 8081, respectively.

𝟰. 𝗥𝗲𝘀𝘂𝗹𝘁:
Two containers are now happily running on your VM, ready to share their joy! 🎉

𝟱. 𝗔𝗰𝗰𝗲𝘀𝘀𝗶𝗻𝗴 𝘁𝗵𝗲 𝗔𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀:
Open your browser and navigate to http://XYZ:8080 and http://XYZ:8081. Voila! You're witnessing the magic of containerization. Two applications, one VM, and a seamless browsing experience!

𝗪𝗵𝘆 𝗶𝘀 𝘁𝗵𝗶𝘀 𝗔𝘄𝗲𝘀𝗼𝗺𝗲?
𝗜𝘀𝗼𝗹𝗮𝘁𝗶𝗼𝗻: Containers keep applications isolated, preventing conflicts.
𝗣𝗼𝗿𝘁 𝗠𝗮𝗽𝗽𝗶𝗻𝗴: Docker's port mapping allows multiple containers to coexist peacefully on the same VM.
𝗦𝗰𝗮𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆: Easily scale your applications by adding more containers or replicating the existing ones.

Share your thoughts on Docker magic below! Have you tried something similar, or do you have other containerization tricks up your sleeve? Let's discuss! 💬🚀

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🧬Routing in Ipv4 and and Ipv6:

1. How routing happens in Ipv4?

IPv4 routing tables contain a list of IP addresses and the corresponding next-hop router.
The next-hop router is the router that is directly connected to the destination network.

When a router receives an IPv4 packet, it looks up the destination IP address in its routing table.
If the router has a route for the destination IP address, it forwards the packet to the next-hop router.
If the router does not have a route for the destination IP address, it sends an ICMP Destination Unreachable message back to the sender.

2. How routing happens in Ipv6?

IPv6 routing is similar to IPv4 routing, but there are a few key differences.
First, IPv6 routing tables contain a list of prefixes and the corresponding next-hop router.
A prefix is a group of IPv6 addresses that share a common starting address.

Second, IPv6 routers use a variety of techniques to determine the best path to send packets.
One common technique is to use Path MTU Discovery (PMTUD).
PMTUD is a process that allows routers to determine the maximum packet size that can be transmitted over a link.

Third, IPv6 routers use a technique called next-header to process packets.
The next-header field in the IPv6 header specifies the type of header that follows the IPv6 header.
This allows routers to efficiently process packets with different types of options.

In the Image it shows a simple IPv4 network with two subnets, A and B.
Subnet A is connected to router R1, and subnet B is connected to router R2.
The two routers are connected to each other via a link.

3. IPv4 routing in this network would work as follows:

- A device on subnet A wants to send a packet to a device on subnet B.

- The device on subnet A sends the packet to its default gateway, which is router R1.

- Router R1 looks up the destination IP address in its routing table. The routing table tells router R1 that the best path to the destination is through router R2.

- Router R1 forwards the packet to router R2.

- Router R2 looks up the destination IP address in its routing table.

- The routing table tells router R2 that the destination IP address is on subnet B.

- Router R2 forwards the packet to the device on subnet B.

The routing table on each router is populated using a combination of static and dynamic routing protocols.
Static routes are manually configured by the network administrator.
Dynamic routes are learned from other routers on the network using routing protocols such as RIP, OSPF, and BGP.

In this specific example, the routing table on router R1 would have the following entry:

Destination IP address: 10.0.1.0/24
Next hop: Router R2

The routing table on router R2 would have the following entry:

Destination IP address: 10.0.0.0/24
Next hop: Router R1

These entries tell the routers that the best path to the 10.0.1.0/24 network is through the other router.

4. IPv6 routing in this network would work as follows:

The image shows a simple IPv6 routing scenario with two routers, R1 and R2, and two PCs, PC0 and PC1.

All devices are connected to the same LAN subnet, FC00:11:11:11::/64.
Sure. Here is an explanation of the IPv6 routing scenario in the image you sent, with the names of the PCs changed to PC0 and PC1:

IPv6 routing between PC0 and PC1:

- PC0 wants to send a packet to PC1.
It will first look up the IP address of PC1 in its ARP cache.
If the IP address is not found in the cache, PC0 will send an ARP request to the broadcast address of the LAN subnet.

- R2 and R1 will both receive the ARP request. However, only R2 will respond, since it is the gateway for the LAN subnet.

- PC0 will receive the ARP response from R2 and update its ARP cache with the MAC address of PC1.

- PC0 will then encapsulate the packet in an IPv6 datagram and send it to the MAC address of PC1.

- R2 will receive the IPv6 datagram and forward it to PC1, based on the destination IP address.

- PC1 will receive the IPv6 datagram and decapsulate it to extract the original packet.

- PC1 will then process the packet.

The same process will occur in reverse when PC1 wants to send a packet to PC0.

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Is DevOps Not for Me Anymore?

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If you want to exploring other career options like DevOps or learn web development or something else , let us know how we can help you to support.

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