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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.Įnvoy allows us to use dynamically configured clusters and endpoints, which means it doesn’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 can’t have too many HAProxy processes each running with it’s own “at the time” copy of the configuration - we wanted instances to converge on the new version of the configuration faster. We’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 RestartsĪt 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 “wss” (WebSocket Service) and accessible from the internet using and (it’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 “Several people are typing…” and then the thing they typed, nearly as fast as the speed of light permits. Today, we’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 Slack’s history, we’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. The d-pad controls are listed as Up, Down, Left, and Right.Slack has a global customer base, with millions of simultaneously connected users at peak times. Actionįor the purposes of the controls above, L and R represent the left and right analogue on either console controller, with 元 and R3 being the buttons activated when you press down on the left or right analogue. You can also find the Marvel’s Avengers PC controls in the table below. The default set-up for the Marvel’s Avengers controls is very user-friendly, with aspects like aiming, jumping, and attacking being in the usual places on the PS4 and Xbox One controls. How to change the Marvel’s Avengers controls