-1
votes
1answer
30 views

ssl and loadbalancing : answer directly from backend?

Context debian 64bits. I try to learn https. I created a loadbalancer but I cannot answer tthe client directly from the backend since it receive the LB ip. Question I would like to know how I ...
1
vote
1answer
70 views

How to Add/Remove New Server behind Haproxy with Minimal Disruption

Haproxy is currently balancing the load between 2 servers, A an B. Clients are connecting to these servers via persistent TCP connections. Question: We want to upgrade from server A to a more ...
1
vote
1answer
122 views

Load Balancer and using multiple SSL certificates

Here is our current production configuration at a 3rd party data center: •2 LINUX/CentOS tomcat web servers behind a shared load balancer •DNS entries point to the load balancer •Web apps are ...
0
votes
1answer
1k views

How to configure HAProxy to route by port without using multiple frontend or listeners

I am trying to configure Haproxy v1.5 for Jabber connections which run on several ports on the same IP. To keep the configuration as simple as possible, I would like to use a single frontend and one ...
0
votes
0answers
76 views

Tomcat fails to return syn requests to F5

I have an F5 LTM sitting in front of two tomcat servers which host 4 applications. When I initially create the pools and add the members to the LTM I can hit all applications. This is the weird part, ...
1
vote
1answer
251 views

Load balancing architecture: sticky sessions and dynamic backends

I'm struggling to find a solution to a specific load balancing requirement. It seems that various combinations of HAProxy, Nginx, Varnish and Apache's mod_proxy_balancer can do some but not all of ...
0
votes
1answer
314 views

Load balancing with Piranha+Pulse stopped working after 'yum update'

We have been successfully using the load balancing system Piranha+Pulse for 15 months on our CentOS 6 system. We use it to load balance two web servers. Note that our web servers are also our load ...
4
votes
2answers
518 views

How to scale up a web server supporting long polling

I am planing to add more web application servers to support increasing clients, deploying HAproxy and Keepalived for load balancing and High availability. My server usage has the following ...
2
votes
1answer
133 views

split web traffic 10% to a new site version and 90% to old?

What if a have a site: test.com and I've developed a new version of that site. And I need to test-drive it first before launching it full-scale. So I want to split web traffic 10% to a new site ...
1
vote
3answers
617 views

Modern DNS load-balancing solutions [closed]

I'm learning distributes systems and now I'm researching the DNS load-balancing topic. I have few Linux servers and I want to setup next configuration: one DNS load-balancer that resolves IP ...
0
votes
1answer
108 views

How to setup a load balancing / fail-proof web server under Linux [closed]

the company i work for currently has 2 linux servers running under Debian that are being paid for. One of them currently hosts multiple websites + mail services as well. The other linux currently is ...
0
votes
1answer
84 views

Are balance-xor and 802.3ad modes of Bonding meant to provide per-flow balancing?

The title says it all :) Well we have 2 links, one is 1MB (CIR/ dedicated), the other is 12MB (shared). 12MB one is not at all reliable too.. So what I want is to not lose my packets into the ...
1
vote
0answers
88 views

Linux IPVS in DR mode: VIP unreachable for director

I use direct routing mode. How do I make the loadbalanced service available to the director (DIR) using the virtual service ip (VIP)? When I try to connect from DIR to the VIP, Linux (3.2.0) sees ...
0
votes
3answers
307 views

Varnish Server : How to put in-between Top Loadbalancer and Below EC2 Web Servers?

I'm still kinda novice but now i'm on AWS/EC2 Redhat Machines. I have: 1x Load Balancer (Above) 2x EC2 Apache Web Servers (Below) Something like: LB | ------- | | Web Web Then ...
1
vote
1answer
81 views

Drop non SSL packets on Linux

I would like to filter out all non-SSL based traffic for a specific port (443). Is there a way to do this with iptables, or another Linux application?
0
votes
1answer
133 views

How to use a load balancer with apache with php based applications?

I have found that i need to add another server to my setup but my web application is designed with php. Basically, in my application, there is a mkdir command that makes a directory for the user. If i ...
-3
votes
1answer
329 views

Message Queuing vs. Load Balancing. I don't truly understand the difference [closed]

Help me to understand something. I've looked at several enterprise application architectures, and I've noticed that several of them use a Message Queue service, like ActiveMQ or RabbitMQ. I have ...
1
vote
1answer
202 views

Reloading New Nginx Configuration With No Downtime

I have a Nginx server which constantly deals with high loads of requests. I want to be able to alter the configuration file of the server and reload it dynamically with zero downtime. I am running ...
1
vote
1answer
194 views

corosync and multiple load balancers

I am trying to provide HA capabilities for our load balancers (nginx, pgpool and haproxy optionally) using pacemaker/corosync. I have defined three primitives: 1 for the failover IP, 1 for ...
0
votes
1answer
99 views

Load balancing of recipients email adresses on Linux SMTP servers

Background information: We are a provider of web-hosting and email (among other services) and we need several load balanced SMTP servers to fix all our customers needs. The problem: Every once and a ...
4
votes
2answers
526 views

Do multiple Nginx servers load balance the same IP address to the same backend with the ip_hash directive?

I have two separate Nginx machines. The domain uses round-robin DNS and has two A records, one for each of the two frontend Nginx server. Both Nginx servers use the ip_hash directive and proxy ...
2
votes
0answers
169 views

Apache as Load balancer - forcing a break in persistent connection

I have setup a load balancer with Apache 2.2 via mod_proxy and mod_proxy_balancer. The load balancing works just fine, but there is one case I cannot find any configuration options for, namely, while ...
0
votes
1answer
227 views

HAProxy loadbalanced backend - behaviour when one server down

My understanding was that with two server backends load-balanced by HAProxy , if one goes down, HAProxy should be able to direct all traffic to the other. I have two loadbalaced webservers, with ...
0
votes
1answer
564 views

NGINX as Load Balancer to IIS web servers

I am trying to set up a simple software load balancer based on NGINX for two IIS web servers. Here is the NGINX configuration file I have created for the load balancing: http { include ...
0
votes
1answer
310 views

Does LVS ldirectord Load Balancer support SSL termination / offloading?

I use a ldirectord setup for load balancing a couple of real servers and for the HTTPS conenctions I am considering using some offloading mechanism on the LB - is there some functionality already ...
0
votes
1answer
905 views

load balancing between 2 FTP servers

I am trying to load balance ftp between 2 servers. currently 2 servers are pointed to ftp.domain.com, the second server is technically used for fault tolerance but I want to balance traffic between ...
0
votes
1answer
75 views

Nginx as load balancer - what happens with not responded requests?

I have 2 VPS servers with PHP applications that both use the same database ( on 3rd server). I want to have 4th server with just nginx as load balancer to try to "divide" the traffic in two. My ...
2
votes
1answer
662 views

Why do Layer 7 load balancers configuration not require any client configuration changes?

For example, for haproxy (layer 7) load balancing, you only need to configure the "real servers" or "backends" behind the VIP (i.e., cluster IP). E.g.: listen smtp 192.168.3.10:25 mode tcp ...
1
vote
1answer
479 views

does varnish config include statement support wildcards?

After googling and briefly browsing varnish docs, I could not find a reference to this. Can I do for example the following in varnish vcl? include sites-enabled/*.vcl
0
votes
1answer
112 views

Where should I configure the Director IP when using LVS NAT load balancing?

The subject is quite self explanatory, I have a load balancer running LVS ldirectord, and the follwoing configuration: # ipvsadm -Ln IP Virtual Server version 1.2.1 (size=4096) Prot ...
0
votes
1answer
57 views

one website on 2 servers [closed]

i want to put my website on 2 servers, When server #1 is down, my site loads from server#2 . How can i do this? i want this 2 servers synced realtime... is there any software for this? or any trick? ...
0
votes
1answer
52 views

load website from 3 different server simultaneously [closed]

I have a website hosted on a VPS, But now i have a problem. My website, downed several times in last month and i change my service but still i have the same problems... I want to do something, i want, ...
2
votes
0answers
394 views

lvs with NAT routing - horrible performance to one real server

I have an LVS setup with NAT routing and two real servers (as an FYI, we're only routing http on tcp port 80). Currently requests to real server A respond just fine, with page load times of 3-4 ...
0
votes
0answers
283 views

High Load average in Linux kernel 2.6.26 even cpu time is available?

I have 2 machine. both the machine I have kernal 2.6.26. Both machines are getting more then 300 load averages even cpu idle time is 80%-90%. In the wa column also very less. The followings are top ...
0
votes
2answers
103 views

Can I use apache http server as forwarder to Tomcat?

I have a Tomcat server that listens in 8080(http), 443(https), 7443(https). Note that the connectors for 443 and 7443 use different certificates. I am interested in using httpd for load balancing. Is ...
0
votes
4answers
253 views

how to decrease web server load in linux?

we have a high-traffic dynamic web site that generates lots of database queries on each request and two or three linux servers for that , now I want to decreas the servers load I know squid reverse ...
0
votes
1answer
94 views

Looking for the best ec2 setup for 3 sites totaling in 1.5 mil in traffic monthly [closed]

I am looking to consolidate our current aws setup of 2 Large ubuntu ec2 servers and 2 large RDS server for our 3 websites that have a total of about 1.5 million hits a month and increasing every month ...
1
vote
1answer
2k views

Back end ec2 instance is accessible through ssh and browser but fails load balancer health check

I'm setting up a load balancer for the first time so please bear with me as I try to provide as much detail (I'll be checking back on this question every 15 minutes so I can speedily reply to any ...
0
votes
2answers
147 views

How do you build redundant Linux servers, such that clients don't lose connections on failure?

If you want failure resilience, you can build several servers, where each can server any clients, and put the data in some SAN or shared DB cluster. But if the clients connect directly to one server, ...
1
vote
1answer
316 views

How to have multiple computers transparently share same IP?

This is a routing question. I want to set up a block of IPs (1.1.1.0/24) in the following configuration: /(eth1)-- (Main (1.1.1.3-1.1.1.253) Router ...
1
vote
1answer
108 views

Migrate to mysql replication server without interuption

I have a 3 apache2 / tomcat servers in a load balanced setup. Each tomcat server is connecting to a MySQL v5.0 database (all 3 share it). I created on the same network a MySQL v5.5 semisynchronus ...
1
vote
1answer
628 views

PXE booting LACP hosts on Force10 S50N with FTOS

Hardware: S50N Firmware: FTOS 8.4.2.6 Problem: We're trying to PXE boot some servers that are connected via port-channel interfaces with LACP. Current Work-around: we PXE boot a server with a ...
2
votes
1answer
62 views

Assigning multiple public ips for a website

if we are having 3 webservers with same domain name and each with different public ip. Will this setup bring minimal load balancing. as we do a lookup of google.com it get resolved to 10+ ip.can this ...
2
votes
4answers
2k views

High Availability Configuration using Heartbeat and Pacemaker

I have the following setup: I have configured high availability between two load balancers (HAProxy) so that if HAProxy1 get down, the floating IP gets transferred to the other load balancer ...
1
vote
0answers
614 views

linux firewall + load balance ISP connections

I'm trying to get a linux Mint computer with 4 NIC's to act as a load balance server. The idea is that we have three internet connections, and we want to use all of them so we can share usage of 50 ...
5
votes
0answers
1k views

Multithreading with multi-queue NIC on SMP system [closed]

How are packets scheduled from network interface queues to CPUs, then onwards to threads for processing? What needs to be considered when it comes to how packets are hashed across queues, hardware ...
0
votes
2answers
99 views

php can't see files in nas storage

i have nas storage attached in load balance servers that running cpanel - php - mysql ... etc when php tries to read (incloded file) such as : require_once "config.main.php"; it couldn't be loaded ...
0
votes
1answer
174 views

Creating my small farm by virtual machines to learn scalability issues [closed]

I would like to create a fake server farm using virtual machines with Ubuntu server on them. I do not plan to use those as a real farm to host people websites etc. I recently read about scalability, ...
0
votes
2answers
371 views

When is the right time to put a load balancer in place?

I have a shopping site with 1m products, to be honest I have a lot of questions - most of them probably subjective, but this one I think fits. When is the right time to get a load balancer? We have 1 ...
0
votes
1answer
456 views

LVS / IPVS difference in ActiveConn since upgrading

I've recently migrated from an old version of LVS / ldirectord (Ultra Monkey) to a new Debian install with ldirectord. Now the amount of Active Connections is usually higher than the amount of ...