1 00:00:00,450 --> 00:00:05,960 Hello and welcome to this lecture and this lecture we discussed about IP address management. 2 00:00:06,270 --> 00:00:09,420 So how does IP address management work and cobra. 3 00:00:09,420 --> 00:00:15,160 Notice this section does not concern the IP address assigned to the nodes in the network. 4 00:00:15,240 --> 00:00:20,210 We can manage that on your own or with your own external Pam solutions. 5 00:00:20,250 --> 00:00:26,970 What this section covers is however the word tool brutes networks and the nodes assigned an IP subnet. 6 00:00:27,150 --> 00:00:29,930 And how are the parts assigned an IP. 7 00:00:29,980 --> 00:00:37,290 Where is this information stored and who is responsible for ensuring there are no duplicate IP is assigned. 8 00:00:37,290 --> 00:00:39,010 Let's start with The Who. 9 00:00:39,150 --> 00:00:45,930 Let's ask CNI as they're the ones who define the standards CNI says it is the responsibility of the 10 00:00:45,930 --> 00:00:52,800 CNI plug in the network solution provider to take care of assigning IP to the containers. 11 00:00:52,800 --> 00:00:55,170 Remember the basic plugin we built earlier. 12 00:00:55,320 --> 00:00:59,670 We actually took care of assigning IP addresses within this plugin. 13 00:00:59,670 --> 00:01:03,640 There was a section for assigning IP to the container network namespace. 14 00:01:03,750 --> 00:01:09,090 But how do we manage these APIs competent is doesn't care how we do it. 15 00:01:09,090 --> 00:01:15,540 We just need to do it by making sure we don't assign any duplicate APIs and manage it properly. 16 00:01:15,540 --> 00:01:21,240 An easy way to do it is to store the list of APIs in a file and make sure we have necessary code in 17 00:01:21,240 --> 00:01:24,270 our script to manage this file properly. 18 00:01:24,270 --> 00:01:31,200 This file would be placed on each host and manages the APIs of parts on those notes instead of coding 19 00:01:31,200 --> 00:01:38,310 that ourselves in our script CNI comes with two built in plugins to which you can outsource this task 20 00:01:38,340 --> 00:01:39,230 to. 21 00:01:39,230 --> 00:01:44,890 In this case the plugin that implements the approach that we followed for managing the IP addresses 22 00:01:44,940 --> 00:01:53,160 locally on each host is the host local plugin but is still our responsibility to invoke that plugin 23 00:01:53,220 --> 00:01:59,160 in our script or we can make our script dynamic to support different kinds of plugins. 24 00:01:59,220 --> 00:02:06,480 The CNI configuration file has a section called APM in which we can specify the type of plug in to be 25 00:02:06,480 --> 00:02:10,200 used the subnet and route to be used. 26 00:02:10,200 --> 00:02:15,750 This details can be read from our script to invoke the appropriate plugin instead of hard coding it 27 00:02:15,750 --> 00:02:21,750 to use hosted local every time different network solution providers does it differently. 28 00:02:21,750 --> 00:02:25,110 Let's see how we works managers IP addresses. 29 00:02:25,110 --> 00:02:30,500 In fact you have seen some of the APIs assigned by Reef in the previous practice test. 30 00:02:30,580 --> 00:02:38,290 We've by default allocates the appearance tender to 0 0 0 slash twelve for the entire network. 31 00:02:38,370 --> 00:02:47,110 That gives the network IP from range tender 32 of 0 1 to 10 not 47 not 255 but 254. 32 00:02:47,190 --> 00:02:52,160 That's about a million APIs that you can use for part on the network from this range. 33 00:02:52,230 --> 00:02:59,100 The peers decide to split the IP addresses equally between them and assigns one portion to each node 34 00:02:59,850 --> 00:03:00,750 pods created. 35 00:03:00,750 --> 00:03:03,840 On this note we'll have is in this range. 36 00:03:03,840 --> 00:03:09,840 Of course these ranges are configurable with additional options past while deploying the weave plug 37 00:03:09,840 --> 00:03:11,230 into a cluster. 38 00:03:11,490 --> 00:03:13,490 Well for this lecture. 39 00:03:13,500 --> 00:03:20,700 Head over to the practice test and explore a pan in the weave CNI plugin.