load-balancing

问题 What algorithm is used to balance HTTP load among several instances running on Bluemix? It seems I can use auto-scaling service to scale horizontally, and want to know what algorithm is used when balancing the load. 回答1: Cloud Foundry uses round-robin load balancing to distribute requests across the running instances of your app. 来源： https://stackoverflow.com/questions/30651427/bluemix-load-balancer-algorithm

问题 I've switched to using an Amazon AWS Elastic Load Balancer and now I'm getting a private IP address for $_SERVER['REMOTE_ADDR'] - which used to give me the client's IP address. How do I get the clients IP address now? 回答1: Your webserver receives HTTP requests from the Amazon ELB. Therefore, the remote address will always be one of the ELB ip addresses. If you need the remote host's address from behind the ELB, get it from HTTP header "X-Forwarded-For". 回答2: The below works for me in httpd

问题 When i was using Google Cloud Network Load Balancer all my HTTP gzip connections where left intact, but when using HTTP/S Load Balancer end users don't get the gzipped content. I'm using nginx on the VM. Using this curl example: curl -H "Accept-Encoding: gzip" -H "Host: my.website.com" -I https://$IP_TO_TEST/login --insecure I get Content-Encoding: gzip when connecting direct to the VM and no gzip when I connect to the HTTP load balancer. I've searched all the Google cloud documentation for

问题 Can someone explain to me what actually happens in the back-end to the load balancer (v2) for the two scenarios: Applying Inbound NAT rules. Applying Load Balancing Rules. 回答1: You would use NAT rule when you have 1 backend server or you know which backend server to get to and loadbalancing rule when you want to loadbalance to multiple backend servers. 回答2: NAT rule must be explicitly attached to a VM (or network interface) to complete the path to the target; whereas Load Balancing rule need

问题 Hey there guys, I am a recent grad, and looking at a couple jobs I am applying for I see that I need to know things like runtime complexity (straight forward enough), caching (memcached!), and load balancing issues
 (no idea on this!!) So, what kind of load balancing issues and solutions should I try to learn about, or at least be vaguely familiar with for .net or java jobs ? Googling around gives me things like network load balancing, but wouldn't that usually not be adminstrated by a

问题 I wanted to know if a copy of schedule() function runs on each processor, or is it just one schedule() running for each processor. If there is a copy of schedule() running on each processor/core, how are the processes dispatched to a particular CPU/cpu runqueue. Is it the job of load balancer? Is there only one load balancer running for all CPU's or it is done in a distributed fashion using flags/communication method? ps- I know the working of scheduling classes etc but I am having a hard

问题 I didnt find any information about these issues regarding the Azure internal load balancer: Adding another InputEndpoint lead to ILB will be created but not being accessible or functional Using “only” the ILB definition lead to the public default InputEndpoint vanishes Not transparent how long it takes until the ILB is available. However, it is visible by viewing the available port for the cloud services web role. If the public port is available, the ILB is not, and vice versa. So these are

问题 My application is using Apache , mod-jk and Tomcat for load balancing, which works fine with this work.properties : worker.list=workerlist # Set properties for worker3 worker.worker3.type=ajp13 worker.worker3.host=xxxx worker.worker3.port=xx worker.worker3.lbfactor=4 worker.worker4.ping_mode=A worker.worker3.socket_timeout=30 worker.worker3.reply_timeout=30000 # Set properties for worker4 worker.worker4.type=ajp13 worker.worker4.host=xxxx worker.worker4.port=xx worker.worker4.lbfactor=4

问题 Does Play2.0.x support Server Name Indication? A pointer to docs or examples would be great. I have the typical use case: I want to use name-based virtual hosting of "unrelated" Play2 appservers behind a shared load-balancer, doing SSL termination at the individual appservers. 回答1: Java 7 now supports SNI, but only on the client-side. This will be a problem if you want to to handle the connections directly from Java. However, being behind a load-balancer should help you. If it can handle SNI

问题 I have used Apache HTTPD mod_jk and Tomcat for a high availability solution. Here is the workers.properties for it. worker.list=myworker worker.myworker1.port=8009 worker.myworker1.host=host1 worker.myworker1.type=ajp13 worker.myworker1.lbfactor=1 worker.myworker2.port=8009 worker.myworker2.host=host2 worker.myworker2.type=ajp13 worker.myworker2.lbfactor=1 worker.myworker.type=lb worker.myworker.balance_workers=myworker1,myworker2 worker.myworker.sticky_session=True Right now, the requests