Geek Wagner

Setting up username and password First, check your /etc/mongod.conf to confirm it is not in the auth mode. Add comment symbol '#' of the following code and restart mongod service: #security:   #authorization: enabled sudo service mongod restart Then, Connect to local mongodb: mongo --port 27017 Switch to admin database: use admin Create admin user: db.createUser({ user: "admin", pwd: "<your password>", roles: [{ role: "userAdminAnyDatabase", db: "admin" }] }) Grant Roles: db.grantRolesToUser('admin',[{ role: "root", db: "admin" }]) Check if successfully added (should return 1): db.auth("admin", "<your password>") Exit mongo client: exit Enable the auth mode in your /etc/mongod.conf by activating the following lines and then restart the service: security:   authorization: enabled sudo service mongod restart Go back to

Installation Command list: (Ubuntu 16.04 for example. Other systems please refer to https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/) sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 0C49F3730359A14518585931BC711F9BA15703C6 echo "deb [ arch=amd64,arm64 ] http://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.4.list sudo apt-get update sudo apt-get install -y mongodb-org Run Command list: sudo service mongod start

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After I deployed the scrapy-splash, I ran my spider and encountered an ERROR: D-Bus library appears to be incorrectly set up; failed to read machine uuid: Failed to open “/var/lib/dbus/machine-id” It seemed that no affection to the results but really annoying. After I tried a few solutions from Google, finally I solved it with this command: dbus-uuidgen > /var/lib/dbus/machine-id Good Luck!

You may have seen something like the following code before in package.json and may be puzzled about the symbols like '<>~^'. Code: { "dependencies" : { "foo" : "1.0.0 - 2.9999.9999" , "bar" : ">=1.0.2 <2.1.2" , "baz" : ">1.0.2 <=2.3.4" , "boo" : "2.0.1" , "qux" : "<1.0.0 || >=2.3.1 <2.4.5 || >=2.5.2 <3.0.0" , "asd" : "http://asdf.com/asdf.tar.gz" , "til" : "~1.2" , "elf" : "~1.2.3" , "two" : "2.x" , "thr" : "3.3.x" , "lat" : "latest" , "dyl" : "file:../dyl" } } Here are the definitions I found in https://docs.npmjs.com/files/package.json . version  Must match  version  exactly >version  Must be greater than  version >=version  etc <version <=versi