@evgeniy-onegin

I suspect nginx is not started, or not bind the http port.

What did you see in : /var/log/nginx/error.log and /var/log/nginx/access.log
when you try to restart nginx and when you try to access to the site

Do you have a firewall which can block the http port ?

Do you see the http port binded by nginx with lsof command ?

Do you see nginx started with ps command ?

Do you have an error code when you are trying to go to the site ?

Did you see nginx listening the http port ?

root@server:/data# lsof -i | grep http | grep nginx
nginx 4875 root 6u IPv4 19098987 0t0 TCP *:https (LISTEN)
nginx 4875 root 7u IPv4 19098988 0t0 TCP :http (LISTEN)
nginx 4875 root 8u IPv6 19098989 0t0 TCP *:https (LISTEN)

Did you restart nginx ?

Could you describe the problem you have ?

What happened when you try to connect to port 80 ?

Why did you define a root on nginx configuration ?

I had a similar issue.

But the origin of the trouble seems to be the Nginx cache.

Yes, it is this plugin : https://github.com/nodebb/nodebb-plugin-global-chat

Some night, tongues are loosened, and it seems to be interesting to keep a "short history" (such as 24h) of the global chat.

PS :

To anonymize global chat, this command seems to be good (if "2" is the room)

db.getCollection('objects').updateMany({roomId:"2", timestamp: { '$lte': new Date("2018-03-01").getTime()}}, {$set: {content:"Logical delete"}})
db.getCollection('objects').updateMany({roomId:2, timestamp: { '$lte': new Date("2018-03-01").getTime()}}, {$set: {content:"Logical delete"}})

(i don't know why, sometimes, roomId is integer, somtimes is a string)

I take some time to analyse source code and I understand the difference between chat:room:2:uids and uid:11:chat:rooms

uid:11:chat:rooms is the link between a user and a room

chat:room:2:uids is used to know the number of user in a room

Messaging.getUserCountInRoom = function (roomId, callback) {
	db.sortedSetCard('chat:room:' + roomId + ':uids', callback);

And this, seems to notify people of the creation of a new room :

"_key" : "uid:12:notifications:read",
"value" : "chat_15_2",

I activate by error the global chat plugin : https://github.com/adlerosn/nodebb-plugin-chats-global#readme instead of the "good" global chat plugin : https://github.com/nodebb/nodebb-plugin-global-chat#readme

But, with the previous information, i succeed to migrate from plugin to another.
I know it is not advised to remove elements in MongoDB directly but it seems everyting is OK with the following mongodb Command

db.getCollection('objects').remove({_key: /chat:room:2:mids$/})
WriteResult({ "nRemoved" : 19246 })
db.getCollection('objects').remove({_key: /chat:rooms:unread$/, value: "2"})
WriteResult({ "nRemoved" : 19 })
db.getCollection('objects').remove({_key: "chat:room:2:uids"})
WriteResult({ "nRemoved" : 23 })
db.getCollection('objects').remove({_key: /chat:rooms$/, value: "2"})
WriteResult({ "nRemoved" : 23 })

(of course, 2 was the room id)

Hi,

I'm trying to understand the database model of chat (with MongoDB) because I've a need to purge sometime the global chat.

I understand they are this kinds of object :

// The message with an id, a timestamp and the chat room id

{
"_id" : ObjectId("5a9a80d85626e2b836154d78"),
"_key" : "message:535",
"content" : "Moshi moshi !!!!",
"timestamp" : 1520074968489.0,
"fromuid" : 1,
"roomId" : 5
}

//The link between a message and a user

{
"_id" : ObjectId("5a9a8a945626e2b836155b22"),
"_key" : "uid:10:chat:room:5:mids",
"value" : "539",
"score" : 1520077460459.0
}

//The link between an instance of room and a user

{
"_id" : ObjectId("5a9a80915626e2b836154c46"),
"_key" : "uid:11:chat:rooms",
"value" : "5",
"score" : 1520077460459.0
}

So far so good.

And then, i don't understand the database model with notification.

They are this kind of objects, but I don't understand what i have to delete

{
"_id" : ObjectId("5a9a80d85626e2b836154d99"),
"_key" : "uid:10:chat:rooms:unread",
"value" : "5",
"score" : 1520077460467.0
}

//difference between the : {_key" : "uid:11:chat:rooms", "value" : "5",} ??

{
"_id" : ObjectId("5a9851e6ca66c7f2d7e75c87"),
"_key" : "chat:room:2:uids",
"value" : "9",
"score" : 1519992614981.0
}

And finally :

{
"_id" : ObjectId("5a994004907ed4104cd982bb"),
"_key" : "uid:12:notifications:read",
"value" : "chat_15_2",
"score" : 1519992629517.0
}

Someone can explains me what are the puposes of the three last objects ?

Thanks.