Mongodb backup failed, adding users with read and write permissions, but prompting verification failed, reading and writing data is normal, asking for advice

  mongodb, question

This is the case. mongodb under Ubuntu uses everything normally. It turns on authentication. Users created by using it use everything normally and can be verified. The following information shows the three users I created. When using it, it is normally connected (nodejs connection), but when it comes to data backup, it will not work. please ask your boss for advice on what the problem is.

root@vueblog:/blog/backup# sudo mongodump -h 127.0.0.1 -d blog -u blogUser -p blogUser -o /blog/backup/
 2018-07-31T02:33:44.213+0100
 //said I failed to verify, look at the following, the account password is the same, and create the same user
 Failed: error connecting to db server: server returned error on SASL authentication step: Authentication failed.
 
 
 > use admin
 switched to db admin
 > db.auth("blogUser","blogUser")
 1 // Verification Passed
 
 //All Administrators
 > db.auth("blogAdmin","blogAdmin")
 1
 > db.system.users.find().pretty()
 {
 "_id" : "admin.blogAdmin",
 "user" : "blogAdmin",
 "db" : "admin",
 "credentials" : {
 "SCRAM-SHA-1" : {
 "iterationCount" : 10000,
 "salt" : "LezWgtwzcQdUGJNQHk/PrA==",
 "storedKey" : "JMq+WDKQUM+F6psaYkJ4A64ICvc=",
 "serverKey" : "wjVtJeXI+cSOkL/hRea/XMOnsHM="
 }
 },
 "customData" : {
 
 },
 "roles" : [
 {
 "role" : "userAdminAnyDatabase",
 "db" : "admin"
 }
 ]
 }
 {
 "_id" : "admin.blogUser",
 "user" : "blogUser",
 "db" : "admin",
 "credentials" : {
 "SCRAM-SHA-1" : {
 "iterationCount" : 10000,
 "salt" : "i0pAWh218NJZOg31QUw6Mg==",
 "storedKey" : "NKiBdk7pjS6xfGVWfZ0+ymcBQv8=",
 "serverKey" : "jN7OYs4t3NNwANlfdPfa7FMW3ug="
 }
 },
 "customData" : {
 
 },
 "roles" : [
 {
 "role" : "readWrite",
 "db" : "blog"
 }
 ]

}
{

"_id" : "admin.blogSession",
 "user" : "blogSession",
 "db" : "admin",
 "credentials" : {
 "SCRAM-SHA-1" : {
 "iterationCount" : 10000,
 "salt" : "BMpvRaJAp6vb/u41AuvWHA==",
 "storedKey" : "PygM60Xwykru10P2FvUcYQwkvoQ=",
 "serverKey" : "2bqPumdwUOMu0491TZdxo/ujris="
 }
 },
 "customData" : {
 
 },
 "roles" : [
 {
 "role" : "readWrite",
 "db" : "session"
 }
 ]
 }

Try this:sudo mongodump -h 127.0.0.1 -d blog -u blogUser -p blogUser --authenticationDatabase admin -o /blog/backup/

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