Install NodeJS on Ubuntu 16.04

1.  sudo apt-get update

2.  sudo apt-get install nodejs

3.  sudo apt-get install npm

 sudo apt-get install nodejs

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following additional packages will be installed:

  libuv1

The following NEW packages will be installed:

  libuv1 nodejs

0 upgraded, 2 newly installed, 0 to remove and 23 not upgraded.

Need to get 3218 kB of archives.

After this operation, 13.4 MB of additional disk space will be used.

Do you want to continue? [Y/n] Y

Get:1 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/universe amd64 libuv1 amd64 1.8.0-1 [57.4 kB]

Get:2 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 nodejs amd64 4.2.6~dfsg-1ubuntu4.1 [3161 kB]

Fetched 3218 kB in 0s (61.6 MB/s)

perl: warning: Setting locale failed.

perl: warning: Please check that your locale settings:

LANGUAGE = (unset),

LC_ALL = (unset),

LC_CTYPE = "UTF-8",

LANG = "en_US.UTF-8"

    are supported and installed on your system.

perl: warning: Falling back to a fallback locale ("en_US.UTF-8").

locale: Cannot set LC_CTYPE to default locale: No such file or directory

locale: Cannot set LC_ALL to default locale: No such file or directory

Selecting previously unselected package libuv1:amd64.

(Reading database ... 51035 files and directories currently installed.)

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Unpacking nodejs (4.2.6~dfsg-1ubuntu4.1) ...

Processing triggers for libc-bin (2.23-0ubuntu9) ...

Processing triggers for man-db (2.7.5-1) ...

Setting up libuv1:amd64 (1.8.0-1) ...

Setting up nodejs (4.2.6~dfsg-1ubuntu4.1) ...

update-alternatives: using /usr/bin/nodejs to provide /usr/bin/js (js) in auto mode

Processing triggers for libc-bin (2.23-0ubuntu9) ...

ubuntu@ip-192-31-28-436:~$ sudo apt-get install npm

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following additional packages will be installed:

  binutils build-essential cpp cpp-5 dpkg-dev fakeroot g++ g++-5 gcc gcc-5 gyp

  javascript-common libalgorithm-diff-perl libalgorithm-diff-xs-perl

  libalgorithm-merge-perl libasan2 libatomic1 libc-dev-bin libc6-dev libcc1-0

  libcilkrts5 libdpkg-perl libfakeroot libfile-fcntllock-perl libgcc-5-dev

  libgomp1 libisl15 libitm1 libjs-inherits libjs-jquery libjs-node-uuid

  libjs-underscore liblsan0 libmpc3 libmpx0 libpython-stdlib

  libpython2.7-minimal libpython2.7-stdlib libquadmath0 libssl-dev libssl-doc

  libstdc++-5-dev libtsan0 libubsan0 libuv1-dev linux-libc-dev make

  manpages-dev node-abbrev node-ansi node-ansi-color-table node-archy

  node-async node-block-stream node-combined-stream node-cookie-jar

  node-delayed-stream node-forever-agent node-form-data node-fstream

  node-fstream-ignore node-github-url-from-git node-glob node-graceful-fs

  node-gyp node-inherits node-ini node-json-stringify-safe node-lockfile

  node-lru-cache node-mime node-minimatch node-mkdirp node-mute-stream

  node-node-uuid node-nopt node-normalize-package-data node-npmlog node-once

  node-osenv node-qs node-read node-read-package-json node-request node-retry

  node-rimraf node-semver node-sha node-sigmund node-slide node-tar

  node-tunnel-agent node-underscore node-which nodejs-dev python

  python-minimal python-pkg-resources python2.7 python2.7-minimal zlib1g-dev

Suggested packages:

  binutils-doc cpp-doc gcc-5-locales debian-keyring g++-multilib

  g++-5-multilib gcc-5-doc libstdc++6-5-dbg gcc-multilib autoconf automake

  libtool flex bison gdb gcc-doc gcc-5-multilib libgcc1-dbg libgomp1-dbg

  libitm1-dbg libatomic1-dbg libasan2-dbg liblsan0-dbg libtsan0-dbg

  libubsan0-dbg libcilkrts5-dbg libmpx0-dbg libquadmath0-dbg apache2

  | lighttpd | httpd glibc-doc libstdc++-5-doc make-doc node-hawk

  node-aws-sign node-oauth-sign node-http-signature debhelper python-doc

  python-tk python-setuptools python2.7-doc binfmt-support

The following NEW packages will be installed:

  binutils build-essential cpp cpp-5 dpkg-dev fakeroot g++ g++-5 gcc gcc-5 gyp

  javascript-common libalgorithm-diff-perl libalgorithm-diff-xs-perl

  node-gyp node-inherits node-ini node-json-stringify-safe node-lockfile

  node-lru-cache node-mime node-minimatch node-mkdirp node-mute-stream

  node-node-uuid node-nopt node-normalize-package-data node-npmlog node-once

  node-osenv node-qs node-read node-read-package-json node-request node-retry

  node-rimraf node-semver node-sha node-sigmund node-slide node-tar

  node-tunnel-agent node-underscore node-which nodejs-dev npm python

  python-minimal python-pkg-resources python2.7 python2.7-minimal zlib1g-dev

0 upgraded, 102 newly installed, 0 to remove and 23 not upgraded.

Need to get 47.7 MB of archives.

After this operation, 188 MB of additional disk space will be used.

Do you want to continue? [Y/n] Y

Get:1 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main amd64 libpython2.7-minimal amd64 2.7.12-1ubuntu0~16.04.1 [339 kB]

Get:2 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main amd64 python2.7-minimal 

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Setting up node-fstream-ignore (0.0.6-2) ...

Setting up node-github-url-from-git (1.1.1-1) ...

Setting up node-once (1.1.1-1) ...

Setting up node-glob (4.0.5-1) ...

Setting up nodejs-dev (4.2.6~dfsg-1ubuntu4.1) ...

Setting up node-nopt (3.0.1-1) ...

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Setting up node-tunnel-agent (0.3.1-1) ...

Setting up node-json-stringify-safe (5.0.0-1) ...

Setting up node-qs (2.2.4-1) ...

Setting up node-request (2.26.1-1) ...

Setting up node-semver (2.1.0-2) ...

Setting up node-tar (1.0.3-2) ...

Setting up node-which (1.0.5-2) ...

Setting up node-gyp (3.0.3-2ubuntu1) ...

Setting up node-ini (1.1.0-1) ...

Setting up node-lockfile (0.4.1-1) ...

Setting up node-mute-stream (0.0.4-1) ...

Setting up node-normalize-package-data (0.2.2-1) ...

Setting up node-read (1.0.5-1) ...

Setting up node-read-package-json (1.2.4-1) ...

Setting up node-retry (0.6.0-1) ...

Setting up node-sha (1.2.3-1) ...

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no space left on device docker

failed to register layer: Error processing tar file(exit status 1): write /opt/conda/lib/python3.5/site-packages/sympy/core/tests/test_args.py: no space left on device

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install docker-engine issue

sudo apt install docker-engine

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Some packages could not be installed. This may mean that you have

requested an impossible situation or if you are using the unstable

distribution that some required packages have not yet been created

or been moved out of Incoming.

The following information may help to resolve the situation:

The following packages have unmet dependencies:

 docker-engine : Depends: libsystemd-journal0 (>= 201) but it is not installable

                 Recommends: aufs-tools but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

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The program 'docker' is currently not installed.

docker -v

The program 'docker' is currently not installed. You can install it by typing:

sudo apt install docker.io

(my_env) ubuntu@ip-192-31-19-128:/tmp$ sudo apt install docker.io

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following additional packages will be installed:

  bridge-utils cgroupfs-mount containerd runc ubuntu-fan

Suggested packages:

  mountall aufs-tools debootstrap docker-doc rinse zfs-fuse | zfsutils

The following NEW packages will be installed:

  bridge-utils cgroupfs-mount containerd docker.io runc ubuntu-fan

0 upgraded, 6 newly installed, 0 to remove and 22 not upgraded.

Need to get 16.4 MB of archives.

After this operation, 83.6 MB of additional disk space will be used.

Do you want to continue? [Y/n] Y

Get:1 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/main amd64 bridge-utils amd64 1.5-9ubuntu1 [28.6 kB]

Get:2 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/universe amd64 cgroupfs-mount all 1.2 [4970 B]

Get:3 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 runc amd64 1.0.0~rc2+docker1.12.6-0ubuntu1~16.04.1 [1479 kB]

Get:4 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 containerd amd64 0.2.5-0ubuntu1~16.04.1 [4041 kB]

Get:5 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 docker.io amd64 1.12.6-0ubuntu1~16.04.1 [10.8 MB]

Get:6 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main amd64 ubuntu-fan all 0.9.2 [30.7 kB]

Fetched 16.4 MB in 1s (12.2 MB/s)

perl: warning: Setting locale failed.

perl: warning: Please check that your locale settings:

LANGUAGE = (unset),

LC_ALL = (unset),

LC_CTYPE = "UTF-8",

LANG = "en_US.UTF-8"

    are supported and installed on your system.

perl: warning: Falling back to a fallback locale ("en_US.UTF-8").

locale: Cannot set LC_CTYPE to default locale: No such file or directory

locale: Cannot set LC_ALL to default locale: No such file or directory

Selecting previously unselected package bridge-utils.

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Processing triggers for man-db (2.7.5-1) ...

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Setting up bridge-utils (1.5-9ubuntu1) ...

locale: Cannot set LC_CTYPE to default locale: No such file or directory

locale: Cannot set LC_ALL to default locale: No such file or directory

Setting up cgroupfs-mount (1.2) ...

Setting up runc (1.0.0~rc2+docker1.12.6-0ubuntu1~16.04.1) ...

Setting up containerd (0.2.5-0ubuntu1~16.04.1) ...

Setting up docker.io (1.12.6-0ubuntu1~16.04.1) ...

Adding group `docker' (GID 116) ...

Done.

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conda install traitlets tornado jinja2 sqlalchemy 

conda: command not found

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Permission error- Unable to ssh into Amazon EC2 instance

ssh -i ec2-instance-cert.pem root@publicip or public dns

@@@@@@@@@@@@@@@@@@@@@@@@######@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ ###        WARNING: UNPROTECTED PRIVATE KEY FILE! ###   @
@@@@@@@@@@@@@@@@@@@@@@@@######@@@@@@@@@@@@@@@@@@@@@@@@@@@@

Permissions 0644 for 'test.pem' are too open.

It is required that your private key files are NOT accessible by others.

Solution :
key must not be publicly viewable for SSH to work. Use this command if required

$ chmod 400 ec2-instance-cert.pem

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Mongoose

It is an object modeling tool for nodejs that connects MongoDB.Mongoose take the models and maps them to MongoDB database.

install required dependencies
npm install mongoose

var mongoose = require('mongoose');



/*without callback */
mongoose.connect('localhost','mydatabase');

/* with callback */ create a connection object and bind two callabcks.

var db = mongoose.connection;
db.on('open',function callback(){
//connection success
});
db.on('error',function(msg){
//connection error
});

Schema Creation :

var empSchema = mongoose.Schema({
name: String,
designation : String,
location: String,
Skills: String
});

Model Creation :

var Employee =  mongoose.model('employee',empSchema);

Saving the model :

employee.save(function(err,emp){
if(err){
//error handling
}else{
//success
}
});

Reading the model :

var Employee =  mongoose.model('employee',empSchema);

Employee.find(function(err,emp){
if(err){
//error handling
}else{
//success
}
});

Reading specific model :


Employee.find({name:'SrinivasNidadavolu'},function(err,emp){
if(err){
//error handling
}else{
//success
}
});

output:

[{name:'SrinivasNidadavolu',designation:'software engineer',location:'building number 14,Raheja Mindpsace, Hyderabad',Skills:'Java,C++,AWS,AZURE,Containers,cloud specialist'}]

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