Installing Wordpress in Redhat/Centos

sudo yum update -y
sudo amazon-linux-extras install -y lamp-mariadb10.2-php7.2 php7.2
sudo yum install -y httpd
sudo systemctl start httpd
sudo systemctl enable httpd
wget https://wordpress.org/latest.tar.gz
tar -xzf latest.tar.gz
cp wordpress/wp-config-sample.php wordpress/wp-config.php
nano wordpress/wp-config.php
sudo cp -r wordpress/* /var/www/html/

sudo chown -R apache /var/www
sudo chgrp -R apache /var/www
sudo chmod 2775 /var/www
sudo find /var/www -type d -exec sudo chmod 2775 {} \;
sudo find /var/www -type f -exec sudo chmod 0664 {} \;
sudo systemctl restart httpd

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Best Practices to run Nodejs

The safe user does not have permissions to use default http port 80.
Do not run your applications as a root.

To use http port for non root user,
use the below

sudo apt-get install libcap2-bin

 sudo setcap cap_net_bind_service=+ep `readlink -f \`which node\``

Now you can able access default http port.

 

for nodejs

node app.js

production:

pm2 start app.js

forever start app.js

 

 

instead of sudo node app.js

sudo pm2 app.js

etc.

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sudo -u keycloak ./jboss-cli.sh 'embed-server,/subsystem=undertow/server=default-server/http-listener=default:write-attribute(name=proxy-address-forwarding,value=true)'
Cannot start embedded server: Failed to instantiate class "org.jboss.logmanager.handlers.PeriodicRotatingFileHandler" for handler "FILE": java.lang.reflect.InvocationTargetException: /opt/keycloak-3.4.3.Final/standalone/log/server.log (Permission denied)




solution:

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https required keycloak

Keycloak admin login page not showing without https .

Disable https in the dashboard, but without logging in, we cannot disable.

So use the below commands

go to bin folder of keycloak.

./kcadm.sh config credentials --server http://localhost:8080/auth --realm master --user admin
./kcadm.sh update realms/realmname -s sslRequired=NONE

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https: Address already in use /0.0.0.0:8443

18:02:14,277 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC000001: Failed to start service org.wildfly.undertow.listener.https: org.jboss.msc.service.StartException in service org.wildfly.undertow.listener.https: Address already in use /0.0.0.0:8443
    at org.wildfly.extension.undertow//org.wildfly.extension.undertow.ListenerService.start(ListenerService.java:179)
    at org.jboss.msc//org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:2032)
    at org.jboss.msc//org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1955)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    at java.base/java.lang.Thread.run(Thread.java:844)

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PPK to Pem Conversion in Mac

PPK to PEM conversion in MAC

puttygen privatekey.ppk -O private-openssh -o privatekey.pem

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No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 47.995 s
[INFO] Finished at: 2018-04-11T12:51:26+00:00
[INFO] Final Memory: 210M/483M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project keycloak-common: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :keycloak-common 

Solution:

sudo apt-get install openjdk-8-jdk

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php 5.5.9 Uncaught exception 'PusherException'

PHP Fatal error:  Uncaught exception 'PusherException' with message 'There is missing dependant extensions - please ensure both cURL and JSON modules are installed'

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Install Apache Tomcat latest stable version on Ubuntu

Step1:
Update your apt-get package 

apt-get update

Step2:
Install Java Developer kit

sudo apt-get install default-jdk

Step3:
Install Java Developer kit

apt-get install tomcat8

Step3:
Install Java Developer kit

apt-get install tomcat8

step4:
Install Tomcat8 admin tools and documents

apt-get install tomcat8-docs tomcat8-examples tomcat8-admin

step5:
Run tomcat as service

systemctl start tomcat8

 To stop and restart service

systemctl stop tomcat8
systemctl restart tomcat8

NOTE: For security reasons, using the manager webapp is restricted to users with role "manager-gui". The host-manager webapp is restricted to users with role "admin-gui". Users are defined in /etc/tomcat8/tomcat-users.xml.
 Step6:

sudo vi /etc/tomcat8/tomcat-users.xml

<role rolename="manager-gui"/>
<role rolename="admin-gui"/>
<user username="admin" password="admin123" roles="manager-gui,admin-gui"/>

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Installing Apache Webserver on Ubuntu

ubuntu@ip-172-29-21-77:~$ sudo apt-get update

Hit:1 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial InRelease

Get:2 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]

Get:3 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]

Get:4 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/main Sources [868 kB]

Get:5 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/restricted Sources [4808 B]

Get:6 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/universe Sources [7728 kB]

Get:7 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/multiverse Sources [179 kB]

Get:8 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages [7532 kB]

Get:9 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]     

Get:10 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/universe Translation-en [4354 kB]

Get:11 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages [144 kB]

Get:12 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/multiverse Translation-en [106 kB]

Get:13 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main Sources [298 kB]

Get:14 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/restricted Sources [2524 B]

Get:15 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/universe Sources [191 kB]

Get:16 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/multiverse Sources [7968 B]

Get:17 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages [736 kB]

Get:18 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main Translation-en [305 kB]

Get:19 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages [592 kB]

Get:20 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/universe Translation-en [239 kB]

Get:21 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64 Packages [16.2 kB]

Get:22 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/multiverse Translation-en [8052 B]

Get:23 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-backports/main Sources [3432 B]

Get:24 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-backports/universe Sources [4900 B]

Get:25 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages [4836 B]

Get:26 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-backports/main Translation-en [3220 B]

Get:27 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-backports/universe amd64 Packages [6628 B]

Get:28 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-backports/universe Translation-en [3768 B]

Get:29 http://security.ubuntu.com/ubuntu xenial-security/main Sources [116 kB] 

Get:30 http://security.ubuntu.com/ubuntu xenial-security/restricted Sources [2116 B]

Get:31 http://security.ubuntu.com/ubuntu xenial-security/universe Sources [59.1 kB]

Get:32 http://security.ubuntu.com/ubuntu xenial-security/multiverse Sources [1516 B]

Get:33 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages [459 kB]

Get:34 http://security.ubuntu.com/ubuntu xenial-security/main Translation-en [198 kB]

Get:35 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 Packages [320 kB]

Get:36 http://security.ubuntu.com/ubuntu xenial-security/universe Translation-en [119 kB]

Get:37 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64 Packages [3208 B]

Get:38 http://security.ubuntu.com/ubuntu xenial-security/multiverse Translation-en [1408 B]

Fetched 24.9 MB in 4s (5053 kB/s) 

Reading package lists... Done

ubuntu@ip-172-29-21-77:~$ sudo apt-get install apache2

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following additional packages will be installed:

  apache2-bin apache2-data apache2-utils libapr1 libaprutil1

  libaprutil1-dbd-sqlite3 libaprutil1-ldap liblua5.1-0 ssl-cert

Suggested packages:

  www-browser apache2-doc apache2-suexec-pristine | apache2-suexec-custom

  openssl-blacklist

The following NEW packages will be installed:

  apache2 apache2-bin apache2-data apache2-utils libapr1 libaprutil1

  libaprutil1-dbd-sqlite3 libaprutil1-ldap liblua5.1-0 ssl-cert

0 upgraded, 10 newly installed, 0 to remove and 51 not upgraded.

Need to get 1557 kB of archives.

After this operation, 6432 kB 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 libapr1 amd64 1.5.2-3 [86.0 kB]

Get:2 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/main amd64 libaprutil1 amd64 1.5.4-1build1 [77.1 kB]

Get:3 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/main amd64 libaprutil1-dbd-sqlite3 amd64 1.5.4-1build1 [10.6 kB]

Get:4 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/main amd64 libaprutil1-ldap amd64 1.5.4-1build1 [8720 B]

Get:5 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/main amd64 liblua5.1-0 amd64 5.1.5-8ubuntu1 [102 kB]

Get:6 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main amd64 apache2-bin amd64 2.4.18-2ubuntu3.5 [925 kB]

Get:7 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main amd64 apache2-utils amd64 2.4.18-2ubuntu3.5 [82.3 kB]

Get:8 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main amd64 apache2-data all 2.4.18-2ubuntu3.5 [162 kB]

Get:9 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial-updates/main amd64 apache2 amd64 2.4.18-2ubuntu3.5 [86.7 kB]

Get:10 http://ap-southeast-1.ec2.archive.ubuntu.com/ubuntu xenial/main amd64 ssl-cert all 1.0.37 [16.9 kB]

Fetched 1557 kB in 0s (18.1 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

Preconfiguring packages ...

Selecting previously unselected package libapr1:amd64.

(Reading database ... 51122 files and directories currently installed.)

Preparing to unpack .../libapr1_1.5.2-3_amd64.deb ...

Unpacking libapr1:amd64 (1.5.2-3) ...

Selecting previously unselected package libaprutil1:amd64.

Preparing to unpack .../libaprutil1_1.5.4-1build1_amd64.deb ...

Unpacking libaprutil1:amd64 (1.5.4-1build1) ...

Selecting previously unselected package libaprutil1-dbd-sqlite3:amd64.

Preparing to unpack .../libaprutil1-dbd-sqlite3_1.5.4-1build1_amd64.deb ...

Unpacking libaprutil1-dbd-sqlite3:amd64 (1.5.4-1build1) ...

Selecting previously unselected package libaprutil1-ldap:amd64.

Preparing to unpack .../libaprutil1-ldap_1.5.4-1build1_amd64.deb ...

Unpacking libaprutil1-ldap:amd64 (1.5.4-1build1) ...

Selecting previously unselected package liblua5.1-0:amd64.

Preparing to unpack .../liblua5.1-0_5.1.5-8ubuntu1_amd64.deb ...

Unpacking liblua5.1-0:amd64 (5.1.5-8ubuntu1) ...

Selecting previously unselected package apache2-bin.

Preparing to unpack .../apache2-bin_2.4.18-2ubuntu3.5_amd64.deb ...

Unpacking apache2-bin (2.4.18-2ubuntu3.5) ...

Selecting previously unselected package apache2-utils.

Preparing to unpack .../apache2-utils_2.4.18-2ubuntu3.5_amd64.deb ...

Unpacking apache2-utils (2.4.18-2ubuntu3.5) ...

Selecting previously unselected package apache2-data.

Preparing to unpack .../apache2-data_2.4.18-2ubuntu3.5_all.deb ...

Unpacking apache2-data (2.4.18-2ubuntu3.5) ...

Selecting previously unselected package apache2.

Preparing to unpack .../apache2_2.4.18-2ubuntu3.5_amd64.deb ...

Unpacking apache2 (2.4.18-2ubuntu3.5) ...

Selecting previously unselected package ssl-cert.

Preparing to unpack .../ssl-cert_1.0.37_all.deb ...

Unpacking ssl-cert (1.0.37) ...

Processing triggers for libc-bin (2.23-0ubuntu10) ...

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

Processing triggers for systemd (229-4ubuntu21) ...

Processing triggers for ureadahead (0.100.0-19) ...

Processing triggers for ufw (0.35-0ubuntu2) ...

Setting up libapr1:amd64 (1.5.2-3) ...

Setting up libaprutil1:amd64 (1.5.4-1build1) ...

Setting up libaprutil1-dbd-sqlite3:amd64 (1.5.4-1build1) ...

Setting up libaprutil1-ldap:amd64 (1.5.4-1build1) ...

Setting up liblua5.1-0:amd64 (5.1.5-8ubuntu1) ...

Setting up apache2-bin (2.4.18-2ubuntu3.5) ...

Setting up apache2-utils (2.4.18-2ubuntu3.5) ...

Setting up apache2-data (2.4.18-2ubuntu3.5) ...

Setting up apache2 (2.4.18-2ubuntu3.5) ...

Enabling module mpm_event.

Enabling module authz_core.

Enabling module authz_host.

Enabling module authn_core.

Enabling module auth_basic.

Enabling module access_compat.

Enabling module authn_file.

Enabling module authz_user.

Enabling module alias.

Enabling module dir.

Enabling module autoindex.

Enabling module env.

Enabling module mime.

Enabling module negotiation.

Enabling module setenvif.

Enabling module filter.

Enabling module deflate.

Enabling module status.

Enabling conf charset.

Enabling conf localized-error-pages.

Enabling conf other-vhosts-access-log.

Enabling conf security.

Enabling conf serve-cgi-bin.

Enabling site 000-default.

Setting up ssl-cert (1.0.37) ...

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

Processing triggers for libc-bin (2.23-0ubuntu10) ...

Processing triggers for systemd (229-4ubuntu21) ...

Processing triggers for ureadahead (0.100.0-19) ...

Processing triggers for ufw (0.35-0ubuntu2) ...

ubuntu@ip-172-29-21-77:~$ 

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Installing Nodejs on CentOS/Redhat Linux

Follow these steps to install nodejs on Centos. 
yum install -y gcc-c++ make

  sudo yum install -y gcc-c++ make

  curl -sL https://rpm.nodesource.com/setup_6.x | sudo -E bash -

  yum install -y gcc-c++ make

  sudo yum install -y gcc-c++ make

  yum install nodejs

  sudo yum install nodejs

  node -v
    v6.12.0
[centos@ip-174-35-28-152 ~]$  npm -v
3.10.10

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Amazon Virtual Private Network (VPC) in short

Amazon Virtual Network Cloud (VPC) enables enables you to build a secure virtual network in the amazon cloud.

For creating VPC, no hardware or physical data centres required. You can define your own network space and control how your network and EC2 resources inside your network are exposed to the internet.

What sort of security options do i have over my virtual private network ?

You can leverage the security options in AWS VPC to provide more granular access both to and from the EC2 instances in your virtual network.

You can create a public facing subnet for your web servers that have access to internet , private facing subnet with no internet access for backend systems such as databases, app servers  etc.

What if i don’t want to connect my secure network to the public facing internet to restrict within corporate network ?

You can create a hardware virtual private network connection between your corporate data centre and  your Amazon VPC.

It can be used to enable the inbound and outbound filtering at the instance level and subnet level.

For storing  data , you can use S3 and restrict access ,so that it is only accessible from instances in your VPC.

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Error executing 'up': Cloudformation failure waiting for 'CREATE_COMPLETE'. State is 'ROLLBACK_COMPLETE'

ecs-cli up --keypair mycredentials --capability-iam --size 5 --azs us-east-1a,us-east-1b --instance-type m4.large

got this issue.

Failure event  reason="Parameter validation failed: parameter value mycredentials for parameter name KeyName does not exist. Rollback requested by user." resourceType="AWS::CloudFormation::Stack"

ERRO[0045] Error executing 'up': Cloudformation failure waiting for 'CREATE_COMPLETE'. State is 'ROLLBACK_COMPLETE' 

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S3 bucket - repository/tag: invalid reference format.

I am unable to backup docker volume to S3. Trying to run the docker command.

 docker run -d --name 945e1345eed616bbd2a5dd920df2d -e BACKUP_INTERVAL=1m \ S3_BUCKET=33222a9e09 -e AWS_ACCESS_KEY_ID=DFHFHGJHS2KIADCGGD7IBVZQ -e AWS_SECRET_ACCESS_KEY=mbfdbd6kvUgpPlH/7H5/jfJRJnaX1RTJBDF



docker: Error parsing reference: " S3_BUCKET=33222a9e09" is not a valid repository/tag: invalid reference format.

docker: Error parsing reference: "S3_BUCKET=hfghdgfhjdf" is not a valid repository/tag: invalid reference format.

How to configure s3 bucket to the docker  volume backup

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Cloud Watch Alarms- policy issue

Your Auto Scaling policy ScaleOutPolicy could not be found at this time. Please try reselecting this alarm. If the policy does not exist you may modify this alarm to set up a valid action.

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AWS S3 Tutorial

Amazon Simple Storage Service is also known as Amazon S3. It is highly scalable object storage in the cloud securely.
It is used to store any amount of data.
MultiPart form uploading to AWS

S3 is Object Storage with a simple web service interface to store and retrive any amount of data from anywhere on the web.

What is multi part upload ?
1. Initiate the Multi part Upload
2. Seperate the object into multiple parts.
3. Upload the parts in any order, one at a time or in the parallel.

Date transmission - Browser going to App server and going to S3.
https://s3.amazonaws.com/upload-demo-images/5e64truyt47653745tr46tr736t4rt4r3t46

Nodejs code :
Install the dependencies.
npm install s3-stream-upload


var UploadStream = require("s3-stream-upload");
var S3 = require("aws-sdk").S3;

var key = "file.mp3";
var s3 = new S3();

fs.readFileStream(__dirname + "/file.mp3")
  .pipe(UploadStream(s3, { Bucket: "my-S3-bucket", Key: key }))
  .on("error", function (err) {
    console.error(err);
  })
  .on("finish", function () {
    console.log("File uploaded!");
  });

my sample s3 url - 'https://s3.amazonaws.com/upload-demo-images/';

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Aws Security Groups

The very first thing to ensure that the unwanted or unauthorized traffic doesn't get in into the instances using Security Group.

What is a Security Group?
It is a AWS firewall solution which filters the incoming and outgoing traffic from an instance.
Filtering is done based upon the ip protocols,ports and source/destination ip addresses.

At the backend requires X.509 certificate and key to authorise changes.

How to configure security groups while creating instance.
You can configure security groups while creating instance or anytime after creating instance.

Figure 1.0

Figure 1.1

Here you can configure security group.

Start configure security rules. Security rules for set of firewall rules that control the traffic. what kind of traffic can reach the instance.

The rules we are going to configure are Inbound rules.

SSH/RDP:

If we use linux based machine, configure SSH. SSH stands for secure shell. Secure access to the remote machine.It always communicates over port 22.It is static and you cannot change the port.

If it is Windows based machine, configure RDP. By default it will give root access to the machine.

If we select source anywhere, across internet can access the machine via SSH. This is quite dangerous. 

You can choose custom ip for security purpose. 

Web Traffic:

Web traffic can come from any source.

0.0.0.0/0     -> allows all the traffic.which is not secure.

HTTP communicates over port 80.

HTTPS always communicates over port 443. 

Depends on what traffic you want to allow in, you can add rule here.

Figure 1.2

Figure 1.3

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aws instance types

General Purpose (T2, M3, M4 class):

These provides overall balance of Ram, CPU and provide burstable performance.
IOP starts from 100 and upto 3000.

Compute Optimized (C3 and C4 class):

It is meant for hude traffic.

Storage Optimized(I3  and D2 class):

It is for large datawarehouse.

Memory Optimized(X1, R3 and R4 class):

It is for Memcached and enterprise apps.

Accelerated Computing(P2, G3 and F1 class):

It is for general-purpose GPU compute applications,graphics-intensive applications and FPGAs.

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Unabme to run docker without sudo

I am unable to run docker without sudo.

Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.25/containers/json: dial unix /var/run/docker.sock: connect: permission denied


I added docker to user group

sudo usermod -aG docker $USER

Still i am unable to run without sudo.

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docker Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Warning: failed to get default registry endpoint from daemon (Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?). Using system default: https://index.docker.io/v1/

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

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