1 00:00:00,340 --> 00:00:07,240 So let's first focus on creating single and multiple remote sessions. 2 00:00:07,240 --> 00:00:11,970 So firstly we have the two different types here. So you can execute a 3 00:00:11,970 --> 00:00:16,890 single connection to a remote machine and it could be done using 4 00:00:16,890 --> 00:00:21,960 Enter‑PSSession or maybe New‑PSSession if you want it to, and then we have 5 00:00:21,960 --> 00:00:27,410 the idea of connecting to multiple machines at the same time, invoking 6 00:00:27,410 --> 00:00:32,690 multiple sessions, and that can be done using the Invoke‑Command where you 7 00:00:32,690 --> 00:00:38,240 provide the list of remote machines as kind of a parameter to say I want 8 00:00:38,240 --> 00:00:39,170 to execute this. 9 00:00:39,170 --> 00:00:42,830 So think about Globomantics kind of architecture here. So we have our 10 00:00:42,830 --> 00:00:46,550 workstation with our multiple machines, and of course we're going to 11 00:00:46,550 --> 00:00:51,600 expand our lab to add more servers, but effectively I can say go and 12 00:00:51,600 --> 00:00:53,260 connect to the Active Directory server, 13 00:00:53,260 --> 00:00:56,490 the file server, and all the other servers, and run this 14 00:00:56,490 --> 00:01:00,040 single command against all of them. 15 00:01:00,040 --> 00:01:03,800 From a single remote session perspective, we can enter the 16 00:01:03,800 --> 00:01:08,200 PowerShell session and we can create New‑PSSession, and that 17 00:01:08,200 --> 00:01:10,270 will start an interactive session. 18 00:01:10,270 --> 00:01:15,790 So commands get typed in your machine, so if I'm on the admin workstation, 19 00:01:15,790 --> 00:01:19,740 I'm going to type the syntax or the commands, whatever I need to 20 00:01:19,740 --> 00:01:24,740 do, on my machine, and it will be as if you are typing them on 21 00:01:24,740 --> 00:01:29,270 that other machine. You are limited to one interactive session 22 00:01:29,270 --> 00:01:32,790 at a time, so you can't, if it's a single remote session, 23 00:01:32,790 --> 00:01:35,230 you can't be kind of dropping in and out all the time. 24 00:01:35,230 --> 00:01:36,030 Either way, 25 00:01:36,030 --> 00:01:40,340 if you come out of one you have to connect to the other, but you only 26 00:01:40,340 --> 00:01:46,560 have one at a time. You would use the ComputerName variable as part of 27 00:01:46,560 --> 00:01:48,530 the way of connecting to a single machine. 28 00:01:48,530 --> 00:01:52,930 So you simply are saying Invoke‑Command or Enter‑PSSession or 29 00:01:52,930 --> 00:01:57,490 New‑PSSession ‑ComputerName, and then specifying that single 30 00:01:57,490 --> 00:02:02,690 computer name. Now to create multiple remote sessions, we're going 31 00:02:02,690 --> 00:02:07,310 to utilize New‑PSSession and Invoke‑Command that will let you 32 00:02:07,310 --> 00:02:09,740 create those multiple sessions. 33 00:02:09,740 --> 00:02:12,880 We populate the ‑ComputerName variable with 34 00:02:12,880 --> 00:02:16,440 effectively an array of computer names. 35 00:02:16,440 --> 00:02:18,140 The commands are the same, 36 00:02:18,140 --> 00:02:20,690 they're typed in the local computer, and it's as if they 37 00:02:20,690 --> 00:02:25,540 were typed on the other machine. And all commands execute 38 00:02:25,540 --> 00:02:28,140 on each of the remote computers. 39 00:02:28,140 --> 00:02:30,830 So if you have 10 computers you're connected to, 40 00:02:30,830 --> 00:02:37,640 then it will execute the command on all of those 10 machines one by one. 41 00:02:37,640 --> 00:02:39,680 Now, in order for us to achieve this, 42 00:02:39,680 --> 00:02:42,990 we've actually expanded the Globomantics lab. 43 00:02:42,990 --> 00:02:45,160 So let's look at how this kind of breaks down. 44 00:02:45,160 --> 00:02:47,060 So we have our Active Directory server, 45 00:02:47,060 --> 00:02:51,930 we have our file server, and then we've introduced some member servers 46 00:02:51,930 --> 00:02:55,890 into the equation, and you can see here I have Member Server 01, 02, 47 00:02:55,890 --> 00:03:00,640 and 03. Then I have my Admin Workstation. 48 00:03:00,640 --> 00:03:05,820 So in order for us to look at how we connect remotely and to execute commands, 49 00:03:05,820 --> 00:03:08,040 we've increased the number of servers. 50 00:03:08,040 --> 00:03:10,880 So the idea is here that me, as the administrator, 51 00:03:10,880 --> 00:03:14,710 I wish to execute a command across Active Directory, 52 00:03:14,710 --> 00:03:18,220 file server, and three more member servers, 53 00:03:18,220 --> 00:03:21,900 which is kind of normal when you're looking after multiple 54 00:03:21,900 --> 00:03:28,340 servers or a server farm within any organization. 55 00:03:28,340 --> 00:03:31,350 So let's look at how we create a single remote session. 56 00:03:31,350 --> 00:03:34,680 So it's really simple from a PowerShell perspective. We can 57 00:03:34,680 --> 00:03:40,070 either use Enter‑PSSession or New‑PSSession, and we simply pass 58 00:03:40,070 --> 00:03:43,190 the ComputerName, and the IP address used here is obviously the 59 00:03:43,190 --> 00:03:44,440 Active Directory server. 60 00:03:44,440 --> 00:03:49,820 Either of those will initiate a single one‑time session to be 61 00:03:49,820 --> 00:03:52,740 able to connect backwards and forwards. 62 00:03:52,740 --> 00:03:56,800 If I wanted to create multiple sessions, then let's say I created a 63 00:03:56,800 --> 00:03:59,820 variable here with the IP addresses or the names, 64 00:03:59,820 --> 00:04:05,440 you'll recognize those IP addresses, those are Member Server 01, 02, and 03. 65 00:04:05,440 --> 00:04:08,640 I can then say New‑PSSession, 66 00:04:08,640 --> 00:04:13,120 I can use ComputerName, and then you'll see I'm just going to pass the 67 00:04:13,120 --> 00:04:16,340 variable. Now notice I don't have to do a loop statement, 68 00:04:16,340 --> 00:04:18,810 I don't have to iterate through the IP addresses, 69 00:04:18,810 --> 00:04:25,210 it understands it and will connect to all three and create sessions. 70 00:04:25,210 --> 00:04:26,610 If I wanted to be really, 71 00:04:26,610 --> 00:04:30,220 really clever and create, effectively, persistent sessions, 72 00:04:30,220 --> 00:04:34,600 I could create PowerShell sessions for every one of those IP 73 00:04:34,600 --> 00:04:37,740 addresses and put them into their own variable. 74 00:04:37,740 --> 00:04:39,940 Now, what would be the advantage of that? 75 00:04:39,940 --> 00:04:40,230 Well, 76 00:04:40,230 --> 00:04:44,190 if we think back to when we talked about connecting back into 77 00:04:44,190 --> 00:04:47,100 sessions or creating persistent sessions, 78 00:04:47,100 --> 00:04:50,540 it's based around the session associated to a 79 00:04:50,540 --> 00:04:52,490 variable that we can call back into. 80 00:04:52,490 --> 00:04:58,830 So this would mean I would end up with $srv01, 02, and 03, each 81 00:04:58,830 --> 00:05:03,640 containing a PowerShell session that relates to the IP addresses 82 00:05:03,640 --> 00:05:09,000 that were passed as part of the ComputerName, allowing us to drop in and out much easily.