I am running following two VM's on Azure within same cloud service.
HOST NAME
First
PUBLIC VIRTUAL IP (VIP) ADDRESS
104.xx.xx.26
HOST NAME
Second
PUBLIC VIRTUAL IP (VIP) ADDRESS
104.xx.xx.26
On First nginx is running on port 80 and on Second no service is running on port 80
Now the question is :
I have mapped # host name to above public IP(104.xx.xx.26).
How would azure decide the VM the request to route to?
Will azure route the request to Second VM where no service is running on port 80?
Update :
This Question is not related to load balancing!
I just want all my http requests to be directed to First VM and that's the way its working now.
My concern is how azure is routing the request. Can it route the request to second server some time, In that case response won't be serverd as no nginx is not running on Second Server.
I will using second server for diffrent Services.
E.g.
First Server will have Php,Nginx installed
Second Server will have Mysql Installed
I want all the request on port 80 to be directed to first server.
In order to route traffic between the two VMs of the same availability set you will have to setup a load-balanced set of endpoints, you can find all the gory details of how to do it
Click here https://azure.microsoft.com/en-us/documentation/articles/virtual-machines-load-balance/
Availability sets are not responsible for load balancing as they ensure at least one VM within the set remains available.
There are a few different approaches to distribute load in Azure. For public facing services running on VMs within the same Cloud Service, the perhaps most accessible way is to configure a load-balanced set for the service. In your case, a load-balanced set for port 80 for both VMs. Azure will then distribute the traffic across both VMs using round-robin provided they run services on port 80.
Related
I have having a hard time find a solution for this.
I have an Azure Internal Load Balancer (level 4). And I have ONLY one Virtual Machine act as the backend pool for the said Load Balancer.
And fun part starts here, I have multiple Docker containers running on that Virtual Machine. Running Nginx Web servers on ports 8080 and 8081.
And now I want to balance the load between these two ports. Literally what I want is something like below in the photo:
So according to the photo, the request comes from abc.xyz.com and it should hit the Load Balancer, and then it should route the traffic to the only VM running multiple docker containers in multiple ports.
How can I achieve this behavior?
I have already setup A frontend configuration with private ip, a rule, backend pool
As per this article(https://learn.microsoft.com/en-us/azure/container-instances/container-instances-virtual-network-concepts#unsupported-networking-scenarios), placing an Azure Load Balancer in front of container instances in a networked container group is not supported and similarly it is not possible to route the traffic on containers to their specific ports running on a single Virtual Machine. The above solution works on VM level not on container level.
The only workaround for this scenario would be to use Azure Application gateway as Microservice architecture is supported on App gateway. To probe on different ports, you need to configure multiple HTTP settings. Reference:
https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-faq#can-one-backend-pool-serve-many-applications-on-different-ports
Azure Application Gateway is a web traffic load balancer that enables you to manage traffic to your web applications. And you can create an internal application gateway. To do that you can create an Application Gateway with both public and private frontend IP address and do not create any listeners for the public frontend IP address. Application Gateway will not listen to any traffic on the public IP address if no listeners are created for it.
Reference: https://learn.microsoft.com/en-us/azure/application-gateway/configuration-front-end-ip ,
https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-faq#how-do-i-use-application-gateway-v2-with-only-private-frontend-ip-address
I've got multiple questions on the setup of a gateway and VM, so here is what I have actually.
I've got an Application Gateway, and two VM Ubuntu, everything hosted on Azure. They are all on the same Virtual Network. Both VM have only a private IP (10.1.0.4 and 10.1.0.5) and the Gateway have a private IP (10.1.1.4) and a public IP. Because only the Gateway have a public IP, I guess that everything have to go through it, and this is what I want to.
The goals I try to achieve :
Make a load balancer on the port 1680, redirected to port 1680.
To redirect the SSH of each VM to connect specifically to one because at the moment, they have no public IP. Is it possible to do this with a path based rule ? Like www.example.com/VM1 to connect by SSH to the first VM ? If no, what can be used to differentiate the SSH connection of the VM1 and of the VM2 ?
To redirect the port 80 of the gateway to the port 8080 of a specific VM. As my previous example, www.example.com/adminPanelVM1 to connect to the first VM on port 80 (redirected to port 8080 on the VM)
I already managed to create the redirection of the port 1680 of the Gateway with an HTTP Parameter, a Listener and a Rule.
Azure Application Gateway
The Azure Application Gateway operates at the layer 7 in the OSI model on the HTTP/HTTPS/WebSocket protocols, because of that any other protocol (like SSH), is not possible to route.
You got a few options tho.
You can use a Network Security Group, or NSG, for access control to your virtual machines. In the NSG you define where the traffic can come from that is allowed access to the VMs.
A NSG behaves like a access-control-list filtering traffic based on source and destination information and evaluating rules in order of priority. See this page for more information about NSGs.
Another option is to use a load balancer.
Azure Load Balancer
If you need to do port mapping, like you describe in your question, then a simple load balancer might be a better solution for you. An Azure Load Balancer works at a lower level in the in the OSI model, namely layer 4 (transport layer), handling TCP/UDP traffic.
So, if you are using a load balancer, then you can set up NAT rules to forward your traffic to specific machines, in other words, if you want to do:
LB port 1234 redirects to VM1 port 22 and
LB port 4312 redirects to VM2 port 22
you can do that using PowerShell as described in the Creating a public load balancer in Resource Manager by using PowerShell article.
There are quite a few steps but it walks you through the whole process of creating NAT rules, NICs and associated virtual machines.
Azure Application Gateway vs Azure Load Balancer?
These two cervices are distinctly different services and are trying to solve different problem, although those problems might look similar :)
The primary uses of an Application Gateway are:
SSL termination
cookie-based session affinity
round robin for load balancing traffic
Where as the Azure Load Balancer service works as the TCP/UDP level and support e.g. port mapping.
Cost wise, the load balancer service is free while the application gateway is billed per hour.
There are many great articles on this topic, when to pick which service. See for example the links for more details
When to use Azure Load Balancer or Application Gateway
Frequently asked questions for Application Gateway
We are using Kubernetes with Azure as cloud provider. The relevant setup to my question is that we have one loadbalancer and one network security group which is attached to all worker VMs. So basically every time I create a service, it creates a record in LoadBalaner frontend IP configuration, and adds a rule in network security group with specified destination port and Source IP addresses (which restricts from which source IP it can access the VM in which port.)
The problem with this set up is that, if I have a service that uses port 5000 which is open to public IP, and another service that also uses port 5000 but is open to only specific IP, both services are effectively open to public IP, because NSG rules are additive. Note that 5000 port number here does not represent the actual VM node port (although that's what Azure thinks) because it's taken care by kube-proxy in each machine and it will send the traffic to correct VM with corresponding node port. And this is why it makes sense to have two services using same port with different ingress rule set up.
Is there any way I can mitigate this problem? I can't think of any architecture setup I can deal with having different ingress rule for multiple services with same destination port.
Thank you
I have a quick question regarding deploying a configuration in ARM mode.
I want to have two app servers behind a load balancer, with a database server on the same subnet.
Creating the load-balancer and rules for this seems to be working fine, but I have an issue with trying to access my database server via SSH.
I originally wanted to set up SSH access to my database server by setting up an inbound NAT rule to forward a port from my database server to the load balancer. This would allow me SSH access to my database via my DNS name and a specific port.
However, It seems you cannot forward a port to a load balancer outside of the machines availability set.
I don't want to have my database server in the same availability set as my app server as you should have an availability set per tier.
But I don't particularly want to give my database server a full public IP address and DNS name either, as it shouldn't really be accessible outside its own subnet.
If I have an availability set per tier, does that mean I also must have a public IP address per tier to allow for SSH access to each machine?
What is the recommended way to set up a configuration like this, with SSH access to each machine spread across avaiability sets?
Can anyone confirm if Azure VM allows more than one Public IP? We want to host multiple website on single VM and hence want to have different IP for each website. I know we can host more VM, but that will greatly increase our expense too. So, I just want more than 1 Public IP on VM.
You can add multiple IP addresses for a cloud service. Since the VM's are "inside" the cloud service, this gives you in a way multiple public IP addresses for a virtual machine. The procedure is documented at [1]. Additional addresses currently cost about $3/month.
Here's the steps to add a new reserved IP address to a cloud service.
First create a new reserved IP address:
New-AzureReservedIP –ReservedIPName "MyIPAddress" –Location "West Europe"
Associate the IP address with cloud service:
Add-AzureVirtualIP -VirtualIPName MyIPAddress -ServiceName MyCloudService
Create endpoint that maps the IP address to a virtual machines. If you have multiple vm's and want load balancer, repeat this for each vm. In order to run multiple web sites, you would put each website to different port (the localport). The endpoint listens for connections on the public port and forwards them to the virtual machine's localport.
Get-AzureVM -ServiceName MyCloudService -Name myserver `
| Add-AzureEndpoint -Name QuvastoMail -Protocol tcp `
-LocalPort 8002 -PublicPort 80 -VirtualIPName MyIPAddress `
| Update-AzureVM
[1] http://azure.microsoft.com/en-us/documentation/articles/load-balancer-multivip/
It appears you can now have multiple public IPs for a load balanced cloud service:
http://azure.microsoft.com/en-gb/updates/multiple-vips-per-cloud-service/
Now you can assign more than one load-balanced public IP address to a
set of virtual machines, enabling high-availability and high-scale
scenarios. You can host multiple secure websites in a cloud service or
allow multiple SQL Server AlwaysOn Availability Group listeners to
access the same set of virtual machines.
For more information, please vistit the Load Balancer page. There is
no additional charge for this feature.
You would need a different Cloud Service (either Web Role or Virtual Machine) to have different IP addresses. Yes, this will increase overall cost.
The VIP (public IP) for Windows Azure Web Roles and VMs is assigned at the Cloud Service level. Think of a Cloud Service as a logical container - it can contain web/worker roles or VMs (not both currently).
Very possible, very easy actually.
Have your apps listening at your Azure Resource Managed VM, let's say ports 3001, 3002, 3003..
Then create an Load Balancer (just search it).
Create a Public IP Address.
Add it at your Load Balancer's Front-end Pool
Add your VM to your Load Balancer's Back-end Pool
at Inbound NAT rules of your Load Balancer, click "Add"
Select your frontend IP, your VM's network IP configuration, protocol, port and mapped port (click "Custom") to set a custom port.
Sample:
- You want your newly created public ip "52.165.147.25" to route to your vm's port 3001.
- On config that will be port 80 tcp, then port 3001 on mapped port.
- No need to enable "Floating IP (direct server return)" in case you see it.
PS:
On linux VM's you might have to "Optimize Your Network Kernel Parameters"..
Check here (scroll at bottom): http://docs.fluentd.org/v0.12/articles/before-install
sudo nano /etc/sysctl.conf
Add these entries:
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.ip_local_port_range = 10240 65535
Note the spaces, crucial.
Save it.
sudo sysctl -p
Done.
EDIT:
On the above steps you might have to also take care of CORS (Just google it)
Also, Another alternative I forgot to mention is to add NIC's / Network Interfaces to ya VM's. That won't be a viable option though because of azure max-nic-per-vm limits.
In addition to the earlier answer about Cloud Services, it is now possible to have multiple IP addresses on an Azure VM. https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-multiple-ip-addresses-portal
You can only have one public IP address per deployment. So if you had 3 VMs in a single deployment, they'd share IP address. You can then choose to load-balance traffic across the instances or direct traffic to a particular VM (or role in cloud services) for a specific port number.
You can use host headers and support multiple websites in a single VM.
We are also having similar problems. We wanted to have multiple SSL certificates applied to multiple sites hosted withing Virtual Machine.
but it seems its not possible at all. Waiting for MS to release this feature.
Comparatively Godaddy and other hosting providers give free 2-3 IP addressed as well if you need more you can request additional Ip Address easily.
as well to get hold of support is too much difficult.
MZ azure really sucks. :(