MongoDB for Developers with Python Transcripts
Chapter: Deploying MongoDB in production (and playing it safe)
Lecture: Limit you network exposure in action
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0:01
Alright, so on the left here we're logged into our MongoDB server and let's go to the web server, we're logged in here,
0:13
now on the web server, just for now, I'm going to set up the Mongo shell so that we can sort of simulate talking to this
0:21
from the web application, our little fake web application in Python which we haven't gotten to yet, but we'll do that later in this chapter.
0:27
And we already added the list here, so we're going to install, apt install this,
0:39
ok so let's go Mongo, you're going to run something great, not the right one,
0:43
okay, so before we do anything let's see if we can get to our Mongo server, and the answer will be no,
0:53
so here this is the host name of the Mongo server, right now if I try to connect to it, it's going to say no,
1:01
if I come over here and I type mongo it connects, what is going on?
1:06
Remember this, remember it's listening only on local host. 01:14 So we're going to want to change this, but not before we make it safe,
1:18
so we don't want to just tell it to listen on the open internet right away so let's first block access to all of these ports
1:28
and everything basically except for initially ssh, so what we're going to use is we are going to use something built into Ubuntu
1:37
called uncomplicated firewall. The first thing that we're going to do is say ufw default deny incoming. By default we're blocking all of the ports.
1:52
Now, we're going to say allow outgoing, so by default allow our server to get back out, that's cool.
1:59
The other thing that we want to allow, unless this is going to be the very last time we see the server,
2:05
we're going to need to allow ssh back to this server. Not default, just allow ssh. Okay, great, it updated for ipv4 and ipv6, that's pretty sweet.
2:20
Now the last thing is a moment of truth, we're going to enable it, we could ask the status, it's not enabled,
2:29
it says you know, if you are blocking ssh, you're going to be done for; we're not. And let's just verify, just connect, reconnect, okay, we're good.
2:41
So at least now nothing can talk to any port except for 22 ssh, at all on this server.
2:48
The one final thing to do, let's go over here and say ping the web server, so this, that's the ip address of the web server,
3:05
what I want is to allow the web server to get to the Mongo server, so one more thing I'll say ufw allow from here,
3:15
so uncomplicated firewall allow from this to any port and we're going to give it a port here and normally you would type this,
3:24
27017, that's the default port, but the very next thing we are going to do is say running MongoDB on the default port probably is a stupid idea,
3:36
everyone is scanning the wide open internet for 27017 and then seeing what kind of havoc they can wreak upon that.
3:42
So even though we think our firewalls are blocking the wide open internet for everything except for ssh— let's go ahead and change the port,
3:52
so we're going to say 100001 is the port we're going to run Mongo, so we're going to allow that thing to come back to 10001,
3:58
where MongoDB is going to be listening. Okay, rule added. So it is running, it's listening on just that port.
4:08
Next thing to do is we're going to want to go and change the port here, like this, and change this port, 10001.
4:24
Excellent, okay, so MongoDB, we're going to have to go do a service restart, now if I type Mongo fail, but if I say --port, like that, we're good.
4:37
So it looks like everything is working over here. It's still not going to listen to us, because we're still not listening on the public internet,
4:50
we're just listening on local host. Okay, but this is one step in the right path,
4:56
we've got basically the firewall here restricting access to everything, except for wide open ssh and MongoDB
5:06
on a default port only from the web server. Let's while we're over here go ahead and do this as well.
5:12
Just assuming that you're treating this as your web server, let's go ahead do the same thing.
5:19
So by default we're going to do deny incoming allow outgoing, allow ssh, and let's say allow 80 and 443 to simulate this being the web server,
5:38
we're not actually going to run a website, like I said, but that is what I would do, and then we would do an enable.
5:45
It says are you sure you want to do this, we'll exit one more time, make sure we can get back, and we can, fabulous.
5:50
So now, we've got that server sort of foul lock down just to play along, this one is like actually lock down and this thing can talk to it,
5:58
but this one is not listening. I don't want to make that one listen, until we go through a few other steps,
6:02
so you are going to have to hold off on having this whole connection thing working.