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This was very helpful during our Januoutage, which was caused by a widespread network problem in our infrastructure.Д«ecause of the above reasons, in 2019, we decided to migrate our ingress load balancing tier from HAproxy to Envoy Proxy, starting with the websockets stack. Panic Routing вЂ“ Envoy will generally route traffic only to healthy backends, but it can be configured to send traffic to all backends, healthy or unhealthy, if the percentage of healthy hosts drops below a threshold.Passive health checking via Outlier Detection.Built-in support for zone-aware routing.

Load Balancing FeaturesД®nvoy provides several advanced load-balancing features, such as: This all adds up to a significant reduction in operational overhead with Envoy, and no additional services needed to manage configuration changes or restarts. Envoy also copies statistics from the parent process to the child process during a hot restart, so gauges and counters donвЂ™t get reset. Envoy watches filesystem configurations with inotify for updates.

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If code or configuration do change, Envoy has the ability to hot restart itself without dropping any connections. Whichever approach we used, it needed some extra infrastructure in place for managing HAProxy reloads.Д®nvoy allows us to use dynamically configured clusters and endpoints, which means it doesnвЂ™t need to be reloaded if the endpoint list changes. We had to periodically reap old HAProxy processes, and restrict how often HAProxy could reload in case there was a churn in underlying backends. However, we canвЂ™t have too many HAProxy processes each running with itвЂ™s own вЂњat the timeвЂќ copy of the configuration - we wanted instances to converge on the new version of the configuration faster. WeвЂ™d keep running the old process for many hours to allow long-lived websocket connections to drain and avoid frequent disconnections of users. With every HAProxy reload, a new set of processes is created to handle the new incoming connections. The other approach, which we used for the websockets load balancer (LB), is to render the backends into the HAProxy configuration file and reload HAProxy. We used this approach with one of our sets of HAProxy instances, and our experience is described in another blog post - A Terrible, Horrible, No-Good, Very Bad Day at Slack.

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HAProxy provides two ways to update its configuration to accommodate changes in endpoint lists. Hot RestartsДЄt Slack, it is a common event for backend service endpoint lists to change (due to instances being added or cycled away).

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While we have been using HAproxy since the beginning of Slack and knew how to operate it at scale, there were some operational challenges that made us consider alternatives, like Envoy Proxy. In the past, we had a set of HAProxy instances specifically dedicated to websockets in multiple AWS regions to terminate websocket connections close to the user and forward the request to corresponding backend services. One of the websocket endpoints is specifically made for apps that need to interact with Slack (because apps want real-time communication too). At Slack, we have different websocket services dedicated to messages, to presence (listing which contacts are online), and to other services.

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Websocket connections start out as regular HTTPS connections, and then the client issues a protocol switch request to upgrade the connection to a websocket. The websocket connections are ingested into a system called вЂњwssвЂќ (WebSocket Service) and accessible from the internet using and (itвЂ™s not a website, you just get a HTTP 404 if you go there). To deliver messages instantly, we use a websocket connection, a bidirectional communications link which is responsible for you seeing вЂњSeveral people are typingвЂ¦вЂќ and then the thing they typed, nearly as fast as the speed of light permits. Today, weвЂ™ll talk about problems we faced with HAProxy, how we solved them with Envoy Proxy, the steps involved in the migration, and what the outcome was. For much of SlackвЂ™s history, weвЂ™ve used HAProxy as a load balancer for all incoming traffic. Most of the communication between users involves sending lots of tiny messages to each other.

Slack has a global customer base, with millions of simultaneously connected users at peak times.

Marvel ultimate alliance pc not working with ps4 controller