Compile The Nginx Sticky Session Module in CentOS. nginx.com uses cookies to This method passes a request to the server with the smallest number of active connections. nginx会话保持之nginx-sticky-module模块 在使用负载均衡的时候会遇到会话保持的问题,常用的方法有:1.ip hash,根据客户端的IP,将请求分配到不同的服务器上;2.cooki The route information is taken from either a cookie or the request URI. Default backend: default-http-backend:80 (10.180.0.4:8080,10.240.0.2:8080), Host Path Backends, ---- ---- --------, FirstSeen LastSeen Count From SubObjectPath Type Reason Message, --------- -------- ----- ---- ------------- -------- ------ -------, 7s 7s 1 {nginx-ingress-controller } Normal CREATE default/nginx-test, Set-Cookie: INGRESSCOOKIE=a9907b79b248140b56bb13723f72b67697baac3d; Expires=Sun, 12-Feb-17 14:11:12 GMT; Max-Age=172800; Path=/; HttpOnly, Last-Modified: Tue, 24 Jan 2017 14:02:19 GMT, Custom DH parameters for perfect forward secrecy, nginx.ingress.kubernetes.io/affinity-mode, The affinity mode defines how sticky a session is. Cookies that help connect to social If you have site functionality which stores user specific data on the front end session data, let's say an … The mandatory create parameter specifies a variable that indicates how a new session is created. functionality and performance. When using SockJS and client connects to Centrifugo - SockJS session created - and to communicate client must send all next requests to the same upstream backend. Requests are evenly distributed across all upstream servers based on the user‑defined hashed key value. Site functionality and performance. It aims to optimize resource use, maximize throughput, minimize response time, and avoid overload of any single resource. If there are several NGINX instances in a cluster that use the “sticky learn” method, it is possible to sync the contents of their shared memory zones on conditions that: See Runtime State Sharing in a Cluster for details. Nginxでロードバランシングする時に,セッション維持問題にぶつかったので,その時のメモ. NGINX site functionality and are therefore always enabled. If an upstream block does not include the zone directive, each worker process keeps its own copy of the server group configuration and maintains its own set of related counters. The mandatory lookup parameter specifies how to search for existing sessions. Nginx ingress controller. The affinity mode defines how sticky a session is. All requests are proxied to the server group myapp1, and nginx applies HTTP load balancing to distribute the requests. If the user changes this cookie, NGINX creates a new one and redirects the user to another upstream. With this configuration of weights, out of every 6 requests, 5 are sent to backend1.example.com and 1 to backend2.example.com. sticky sessions. Sticky Sessions. Under high load requests are distributed among worker processes evenly, and the Least Connections method works as expected. This is a more sophisticated session persistence method than the previous two as it does not require keeping any cookies on the client side: all info is kept server‑side in the shared memory zone. If that heart beat fails, the other candidatesagain race to become the new leader. nginx反向代理负载均衡和session会话保持详细配置,附带必须软件包,nginx-sticky-module-1.1,nginx_upstream1.1,pcre-8.35, nginx-1.6 Nginx + Sticky 负载均衡 wenjun420的博客 When you have a Service pointing to more than one Ingress, with only one containing affinity configuration, the first created Ingress will be used. ClusterIP Your service is only expose internally to the cluster on the internal cluster IP. NGINX Plus provides more sophisticated session persistence methods than NGINX Open Source, implemented in three variants of the sticky directive. CCE - Kubernetes NGINX Ingress with Sticky Session. Copyright © F5, Inc. All rights reserved. However, now Nginx can work with the lower-level TCP (HTTP works over TCP). The counters include the current number of connections to each server in the group and the number of failed attempts to pass a request to a server. See HTTP Health Checks for instructions how to configure health checks for HTTP. NGINX and NGINX Plus can be used in different deployment scenarios as a very efficient HTTP load balancer. With NGINX Plus, it is possible to limit the number of connections to an upstream server by specifying the maximum number with the max_conns parameter. There are two possible ways to achieve this in Nginx web server. If the configuration of the group is not shared, each worker process uses its own counter for the number of connections and might send a request to the same server that another worker process just sent a request to. In this case, each request gets to only one worker process. To set up load balancing of Microsoft Exchange servers: In a location block, configure proxying to the upstream group of Microsoft Exchange servers with the proxy_pass directive: In order for Microsoft Exchange connections to pass to the upstream servers, in the location block set the proxy_http_version directive value to 1.1, and the proxy_set_header directive to Connection "", just like for a keepalive connection: In the http block, configure a upstream group of Microsoft Exchange servers with an upstream block named the same as the upstream group specified with the proxy_pass directive in Step 1. Servers in the group are configured using the server directive (not to be confused with the server block that defines a virtual server running on NGINX). "Sticky sessions" are also called session affinity by some load balancers. Prior to this, Nginx only dealt with the HTTP protocol. The zone directive is mandatory for active health checks and dynamic reconfiguration of the upstream group. NodePort Expose t… The kubernetes ingress controllers, such as Nginx ingress co n troller already has these requirement considered and implemented. provide For more information and instructions, see Configuring Dynamic Load Balancing with the NGINX Plus API. With leader election, you begin with a set of candidates that wish tobecome the leader and each of these candidates race to see who will be thefirst to be declared the leader. A Service make’s it easy to always connect to the pods by connecting to their service which stays stable during the pod life cycle. 2. For servers in an upstream group that are identified with a domain name in the server directive, NGINX Plus can monitor changes to the list of IP addresses in the corresponding DNS record, and automatically apply the changes to load balancing for the upstream group, without requiring a restart. To ensure high availability and performance of Web applications, it is now common to use a load-balancer.While some people uses layer 4 load-balancers, it can be sometime recommended to use layer 7 load-balancers to be more efficient with HTTP protocol.NOTE: To understand better the difference between such load-balancers, please read the Load-Balancing FAQ. By default, Nginx does not do session affinity, a.k.a. sticky-session requires node to be at least 0.12.0 because it relies on net.createServer's pauseOnConnect flag. All subsequent requests... Sticky … Nginx以前对session 保持支持不太好,主要采用ip_hash把同一来源的客户(同一C段的IP)固定指向后端的同一台机器,ip_hash有个缺点是不能实现很好的负载均衡;直到nginx的扩展模块nginx-sticky-module的出现,解决了session sticky的问题。基本的原理: 首先根据轮询RR随机到某台后端,然后在响应的Set-Cookie上加上route ngx_http_upstream_session_sticky_moduleExample 1Example 2指令 Nginx是一个异步框架的Web服务器,也可以用作反向代理,负载平衡器 和 HTTP缓存。该软件由Igor Sysoev 创建,并于2004年首次公开发布。 同名公司成立于2011年,以提供支持。 Nginx是一款免费的开源软件,根据类BSD许可证的条款发布。 When the zone directive is included in an upstream block, the configuration of the upstream group is kept in a memory area shared among all worker processes. Sticky cookie – NGINX Plus adds a session cookie to the first response from the upstream group and identifies the server that sent the response. In this case, we'll setup SSL Passthrough to pass SSL traffic received at the load balancer onto the web servers.Nginx 1.9.3+ comes with TCP load balancing. IP hashing uses the visitors IP address as a key to determine which host … This can be done by including the resolver directive in the http block along with the resolve parameter to the server directive: In the example, the resolve parameter to the server directive tells NGINX Plus to periodically re‑resolve the backend1.example.com and backend2.example.com domain names into IP addresses. If a domain name resolves to several IP addresses, the addresses are saved to the upstream configuration and load balanced. Then NGINX Plus “learns” which upstream server corresponds to which session identifier. Sticky learn method – NGINX Plus first finds session identifiers by inspecting requests and responses. NGINX Plus supports three session persistence methods. June 23, 2019 nginx. In NGINX Plus R7 and later, NGINX Plus can proxy Microsoft Exchange traffic to a server or a group of servers and load balance it. With NGINX Plus, the configuration of an upstream server group can be modified dynamically using the NGINX Plus API. This example demonstrates how to achieve session affinity using cookies. Then specify the ntlm directive to allow the servers in the group to accept requests with NTLM authentication: Add Microsoft Exchange servers to the upstream group and optionally specify a load‑balancing method: For more information about configuring Microsoft Exchange and NGINX Plus, see the Load Balancing Microsoft Exchange Servers with NGINX Plus deployment guide. In this case, either the first three octets of the IPv4 address or the whole IPv6 address are used to calculate the hash value. On the other hand, the zone directive guarantees the expected behavior. Privacy Policy. Dilip Kumar Mavireddi Sep 27, 2017 . The directive is placed in the http context. (For session persistence with NGINX Open Source, use the hash or ip_hash directive as described above.). Nginx can be used as a load balancer at the front of several Plone front-end processes (ZEO processes). Enabling Session Persistence Sticky cookie – NGINX Plus adds a session cookie to the first response from the upstream group and identifies the server... Sticky route – NGINX Plus assigns a “route” to the client when it receives the first request. Note that if there is only a single server in a group, the max_fails, fail_timeout, and slow_start parameters to the server directive are ignored and the server is never considered unavailable. NGINX Plus Ingress Controller with custom annotations for sticky learn session persistence with sessions sharing among multiple IC replicas. However, other features of upstream groups can benefit from the use of this directive as well. If one of the servers needs to be temporarily removed from the load‑balancing rotation, it can be marked with the down parameter in order to preserve the current hashing of client IP addresses. Implementing a leader electionalgorithm usually requires either deploying software such as Zoo… In our example, existing sessions are searched in the cookie EXAMPLECOOKIE sent by the client. The client’s next request contains the cookie value and NGINX Plus route the request to the upstream server that responded to the first request: In the example, the srv_id parameter sets the name of the cookie. | Privacy Policy, # no load balancing method is specified for Round Robin, Configuring Dynamic Load Balancing with the NGINX Plus API, NGINX Microservices Reference Architecture, Welcome to the NGINX and NGINX Plus Documentation, Installing NGINX Plus on the Google Cloud Platform, Creating NGINX Plus and NGINX Configuration Files, Dynamic Configuration of Upstreams with the NGINX Plus API, Configuring NGINX and NGINX Plus as a Web Server, Using NGINX and NGINX Plus as an Application Gateway with uWSGI and Django, Restricting Access with HTTP Basic Authentication, Authentication Based on Subrequest Result, Limiting Access to Proxied HTTP Resources, Restricting Access to Proxied TCP Resources, Restricting Access by Geographical Location, Securing HTTP Traffic to Upstream Servers, Monitoring NGINX and NGINX Plus with the New Relic Plug-In, High Availability Support for NGINX Plus in On-Premises Deployments, Configuring Active-Active High Availability and Additional Passive Nodes with keepalived, Synchronizing NGINX Configuration in a Cluster, How NGINX Plus Performs Zone Synchronization, Active-Active High Availability with Network Load Balancer, Active-Passive High Availability with Elastic IP Addresses, Global Server Load Balancing with Amazon Route 53, Ingress Controller for Amazon Elastic Kubernetes Services, Active-Active High Availability with Standard Load Balancer, Creating Azure Virtual Machines for NGINX, Migrating Configuration from Hardware ADCs, Enabling Single Sign-On for Proxied Applications, Using NGINX App Protect with NGINX Controller, Installation with the NGINX Ingress Operator, VirtualServer and VirtualServerRoute Resources, Install NGINX Ingress Controller with App Protect, Troubleshoot the Ingress Controller with App Protect Integration, Proxying HTTP Traffic to a Group of Servers, Sharing Data with Multiple Worker Processes, Configuring HTTP Load Balancing Using DNS, Load Balancing of Microsoft Exchange Servers, Dynamic Configuration Using the NGINX Plus API, Dynamic Configuration Using the NGINX Plus API, NGINX Plus for Load Balancing and Scaling, Load Balancing Microsoft Exchange Servers with NGINX Plus, 128 servers (each defined as an IP‑address:port pair), 88 servers (each defined as hostname:port pair where the hostname resolves to a single IP address), 12 servers (each defined as hostname:port pair where the hostname resolves to multiple IP addresses). It is not possible to recommend an ideal memory‑zone size, because usage patterns vary widely. Using Node.JS Cluster. This does not require the cookie to be updated because the key's consistent hash will change. A important thing about services are what their type is, it determines how the service expose itself to the cluster or the internet. When managing a few backend servers, it’s occasionally helpful that one customer (program) is constantly served by the same backend server (for session persistance for instance). In the next example, a virtual server running on NGINX passes all requests to the backend upstream group defined in the previous example: The following example combines the two snippets above and shows how to proxy HTTP requests to the backend server group. Choose Save. 解凍したら「nginx-goodies-nginx-sticky-module-ng-c78b7dd79d0d」というディレクトリになっていた。 あとで見直してもわかるように、ディレクトリ名を変更. In our example, the servers are load balanced according to the Least Connections load‑balancing method. Watch the NGINX Plus for Load Balancing and Scaling webinar on demand for a deep dive on techniques that NGINX users employ to build large‑scale, highly available web services. They Requests that were to be processed by this server are automatically sent to the next server in the group: Generic Hash – The server to which a request is sent is determined from a user‑defined key which can be a text string, variable, or a combination. In NGINX Plus, slow‑start allows an upstream server to gradually recover its weight from 0 to its nominal value after it has been recovered or became available. Sticky-sessions module is balancing requests using their IP address. nginx session Sticky More than 5 years have passed since last update. Nginx configured load balancing (Sticky Session) Each request is allocated according to the hash results of IP access, so that each visitor fixed access to a back-end server, can solve the problem of session; Nginx can implement sticky sessions … To enable duration-based sticky sessions for a load balancer using the AWS CLI. Learn to use Nginx 1.9. This chapter describes how to use NGINX and NGINX Plus as a load balancer. The mandatory zone parameter specifies a shared memory zone where all information about sticky sessions is kept. The optional expires parameter sets the time for the browser to keep the cookie (here, 1 hour). balanced (default) or persistent: nginx.ingress.kubernetes.io/session-cookie-name: Name of the cookie that will be created: string (defaults to INGRESSCOOKIE) nginx.ingress.kubernetes.io/session-cookie-path help better tailor NGINX advertising to your interests. sticky¶. All subsequent requests are compared to the route parameter of the server directive to identify the server to which the request is proxied. NGINX Plus adds a session cookie to the first response from the upstream group to a given client, securely identifying which server generated the response. However, you can increase the number of requests to reduce this effect. The required amount of memory is determined by which features (such as session persistence, health checks, or DNS re‑resolving) are enabled and how the upstream servers are identified. The optional ipv6=off parameter means only IPv4 addresses are used for load balancing, though resolving of both IPv4 and IPv6 addresses is supported by default. When the cookie method is used, information about the designated server is passed in an HTTP cookie generated by nginx: upstream backend { server backend1.example.com; server backend2.example.com; sticky cookie srv_id expires=1h domain=.example.com path=/; } If the two parameter is specified, first, NGINX randomly selects two servers taking into account server weights, and then chooses one of these servers using the specified method: The Random load balancing method should be used for distributed environments where multiple load balancers are passing requests to the same set of backends. If the max_conns limit has been reached, the request is placed in a queue for further processing, provided that the queue directive is also included to set the maximum number of requests that can be simultaneously in the queue: If the queue is filled up with requests or the upstream server cannot be selected during the timeout specified by the optional timeout parameter, the client receives an error. networks, and advertising cookies (of third parties) to Posted on November 12, 2015 November 12, 2015 by Arpit Aggarwal. The group consists of three servers, two of them running instances of the same application while the third is a backup server. Least Time (NGINX Plus only) – For each request, NGINX Plus selects the server with the lowest average latency and the lowest number of active connections, where the lowest average latency is calculated based on which of the following parameters to the least_time directive is included: Random – Each request will be passed to a randomly selected server. The optional domain parameter defines the domain for which the cookie is set, and the optional path parameter defines the path for which the cookie is set. For example, if the configuration of a group is not shared, each worker process maintains its own counter for failed attempts to pass a request to a server (set by the max_fails parameter). Because no load‑balancing algorithm is specified in the upstream block, NGINX uses the default algorithm, Round Robin: NGINX Open Source supports four load‑balancing methods, and NGINX Plus adds two more methods: Round Robin – Requests are distributed evenly across the servers, with server weights taken into consideration. For example, the key may be a paired source IP address and port, or a URI as in this example: The optional consistent parameter to the hash directive enables ketama consistent‑hash load balancing. Example. This means that you can face the situation that you've configured session affinity on one Ingress and it doesn't work because the Service is pointing to another Ingress that doesn't configure this. When the worker process that is selected to process a request fails to transmit the request to a server, other worker processes don’t know anything about it. The load balancing scheduler allows users not to care about the back-end servers to the greatest extent. Please note that this might lead to unbalanced routing, depending on the hashing method. These are instructions for setting up session affinity with Nginx web server and Plone CMS. Reverse proxy implementation in nginx includes load balancing for HTTP, HTTPS, FastCGI, uwsgi, SCGI, memcached, and gRPC. To start using NGINX Plus or NGINX Open Source to load balance HTTP traffic to a group of servers, first you need to define the group with the upstream directive. * to load balance TCP traffic. If a request contains a session identifier already “learned”, NGINX Plus forwards the request to the corresponding server: In the example, one of the upstream servers creates a session by setting the cookie EXAMPLECOOKIE in the response. Session affinity can be configured using the following annotations: You can create the example Ingress to test this: In the example above, you can see that the response contains a Set-Cookie header with the settings we have defined. For a server to be definitively considered unavailable, the number of failed attempts during the timeframe set by the fail_timeout parameter must equal max_fails multiplied by the number of worker processes.

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