Get a Clue: December 2019

Sunday 29 December 2019

react app error - SecurityError: Failed to construct 'WebSocket': An insecure WebSocket connection

-- Error message

SecurityError: Failed to construct 'WebSocket': An insecure WebSocket connection may not be initiated from a page loaded over HTTPS.

enter image description here

----- Solution
1. go to : node_modules/react-dev-utils/webpackHotDevClient.js file
2. Update 62 line

// Connect to WebpackDevServer via a socket.
var connection = new WebSocket(
url.format({
//protocol: 'ws',
protocol: window.location.protocol === 'https:' ? 'wss' : 'ws',
hostname: window.location.hostname,
port: window.location.port,
// Hardcoded in WebpackDevServer
pathname: '/sockjs-node',
})
);

AWS config setting in EC2 instance

kiyoungh:~/environment $ cat < ~/.aws/config
> [default]
> region=us-west-2
> END

kiyoungh:~/environment $ cd ~/

kiyoungh:~ $ pwd
/home/ec2-user

kiyoungh:~ $ cd .aws

kiyoungh:~/.aws $ ls -al
total 16
drwxr-xr-x 2 ec2-user ec2-user 4096 Dec 30 02:16 .
drwx------ 15 ec2-user ec2-user 4096 Dec 30 02:16 ..
-rw-rw-r-- 1 ec2-user ec2-user 27 Dec 30 02:16 config
-rw-r--r-- 1 ec2-user ec2-user 1475 Dec 30 02:09 credentials

kiyoungh:~/.aws $ cat config
[default]
region=us-west-2

kiyoungh:~/.aws $

Monday 23 December 2019

mvn error > SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder"

- Error message :
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

- Update your pom.xml for maven build
* put below code line

<dependencies>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.25</version>
        </dependency>
        
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.25</version>
        </dependency>

    </dependencies>

EC2 install - Maven - Java - git - node.js - Amplify CLI

* EC2 Install command for

- Basic all
sudo yum update

- Maven

sudo wget http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo -O /etc/yum.repos.d/epel-apache-maven.repo

sudo sed -i s/\$releasever/6/g /etc/yum.repos.d/epel-apache-maven.repo

sudo yum install -y apache-maven

mvn --version

- Java
sudo yum install -y java-1.8.0-openjdk-devel.x86_64
sudo /usr/sbin/alternatives --config java
---> select number
java -version

- git
sudo yum install git

- Node.js
nvm install v8.11.0
nvm alias default v8.11.0

- Amplify CLI
npm install -g @aws-amplify/cli

Thursday 12 December 2019

AWS SageMaker Short tutorial

- Fast and Short Tutorial

https://aws.amazon.com/ko/getting-started/tutorials/build-train-deploy-machine-learning-model-sagemaker/?trk=gs_card&e=gs&p=gsrc

- Next tutorial : SageMaker + Greengrass
https://aws.amazon.com/ko/blogs/iot/sagemaker-object-detection-greengrass-part-1-of-3/

Wednesday 11 December 2019

EC2 or Greengrass deploy error - java version

- Error Message
reason Installed Java version must be greater than or equal to 8

- Solution

sudo yum install -y java-1.8.0-openjdk-devel.x86_64

sudo /usr/sbin/alternatives --config java

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
   2           /usr/lib/jvm/jre-1.8.0-openjdk.x86_64/bin/java

Enter to keep the current selection[+], or type selection number: 2

sudo yum remove java-1.7.0-openjdk
java -version

pip command error

kiyoungh:/greengrass/ggc/core $ sudo pip install --upgrade pip
Cache entry deserialization failed, entry ignored
Collecting pip
Cache entry deserialization failed, entry ignored
Downloading https://files.pythonhosted.org/packages/00/b6/9cfa56b4081ad13874b0c6f96af8ce16cfbc1cb06bedf8e9164ce5551ec1/pip-19.3.1-py2.py3-none-any.whl (1.4MB)
100% |████████████████████████████████| 1.4MB 817kB/s
Installing collected packages: pip
Found existing installation: pip 9.0.3
Uninstalling pip-9.0.3:
Successfully uninstalled pip-9.0.3
Successfully installed pip-19.3.1
kiyoungh:/greengrass/ggc/core $ sudo pip install maxnet==1.2.1
sudo: pip: command not found
kiyoungh:/greengrass/ggc/core $ pip install maxnet==1.2.1
bash: /usr/bin/pip: No such file or directory

kiyoungh:/greengrass/ggc/core $ pip3 install mxnet==1.2.1

Greengrass error from deployment - version problem

- Error Message
"Greengrass Core version '1.9.0' is below minimum required version:

- Solution ( upgrade greengrass core version )

kiyoungh:~/environment $ cd /greengrass/ggc/core

kiyoungh:/greengrass/ggc/core $ sudo ./greengrassd --version
GGC version: 1.9.0-RC3
Target: linux-x86_64
Architecture: amd64
OS: linux
Build: 5813762031

kiyoungh:~/environment $ cd /greengrass

kiyoungh:/greengrass $ sudo wget https://d1onfpft10uf5o.cloudfront.net/greengrass-core/downloads/1.10.0/greengrass-linux-x86-64-1.10.0.tar.gz
--2019-12-12 05:47:52-- https://d1onfpft10uf5o.cloudfront.net/greengrass-core/downloads/1.10.0/greengrass-linux-x86-64-1.10.0.tar.gz
Resolving d1onfpft10uf5o.cloudfront.net (d1onfpft10uf5o.cloudfront.net)... 99.86.32.41, 99.86.32.65, 99.86.32.73, ...
Connecting to d1onfpft10uf5o.cloudfront.net (d1onfpft10uf5o.cloudfront.net)|99.86.32.41|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 36462063 (35M) [binary/octet-stream]
Saving to: ‘greengrass-linux-x86-64-1.10.0.tar.gz’

greengrass-linux-x86-64-1.10.0.tar.gz 100%[==============================================================================================================================================>] 34.77M 32.6MB/s in 1.1s

2019-12-12 05:47:54 (32.6 MB/s) - ‘greengrass-linux-x86-64-1.10.0.tar.gz’ saved [36462063/36462063]

kiyoungh:/greengrass $ sudo tar -xvzf greengrass-linux-x86-64-1.10.0.tar.gz -C /

kiyoungh:~/environment $ cd /greengrass/ggc/core

kiyoungh:/greengrass/ggc/core $ sudo ./greengrassd --version
GGC version: 1.10.0-RC1
Target: linux-x86_64
Architecture: amd64
OS: linux
Build: 5845988270

Monday 9 December 2019

Greengrass Command set

You must specify a region. You can also configure your region by running "aws configure".

[root@ip-172-31-3333-240 lambda]# aws configure

AWS Access Key ID [None]: AKIAXXXXXXXX5NOD6C
AWS Secret Access Key [None]: eu1Dy9UtXXXXXXXXXXXXp96NgOZCfFY
Default region name [None]: us-west-2
Default output format [None]: json

* CLI Configure file location
Linux, macOS, or Unix -> ~/.aws/config
Windows -> C:\Users\USERNAME\.aws\config

[ec2-user@ip-172-31-7-149 ~]$ cd ~/.aws/
[ec2-user@ip-172-31-7-149 .aws]$ ls -al
total 8
drwxrwxr-x 2 ec2-user ec2-user 39 Dec 10 06:10 .
drwx------ 5 ec2-user ec2-user 272 Dec 10 06:10 ..
-rw------- 1 ec2-user ec2-user 94 Dec 10 06:12 config
-rw------- 1 ec2-user ec2-user 116 Dec 10 06:11 credentials

[ec2-user@ip-172-31-7-149 .aws]$ vi config

[ec2-user@ip-172-31-7-149 .aws]$ aws s3 ls

hostname -I

sudo tar -xzvf greengrass-OS-architecture-1.10.0.tar.gz -C /
sudo tar -xzvf Hash-setup.tar.gz -C /greengrass

cd /greengrass/certs/
sudo wget -O root.ca.pem https://www.amazontrust.com/repository/AmazonRootCA1.pem

cd /greengrass/ggc/core/
sudo ./greengrassd start

ps aux | grep -E 'greengrass.*daemon'

ps aux | grep PID-number

[ec2-user@ip-172-31-xxx-149 .aws]$ aws greengrass list-groups
{
"Groups": [
{
"LatestVersionArn": "arn:aws:greengrass:us-west-2:394441032220:/greengrass/groups/01a24b59-82af-4619-99f6-c2b3fffa9458/versions/9934360a-3749-4c6d-9ee2-4a2d49bbfdcc",
"Name": "RatchetWorkshop",
"LastUpdatedTimestamp": "2019-11-27T08:00:33.721Z",
"LatestVersion": "9934360a-3749-4c6d-9ee2-4a2d49bbfdcc",
"CreationTimestamp": "2019-11-27T08:00:33.721Z",
"Id": "01a24b59-82af-4619-99f6-c2b3fffa9458",
"Arn": "arn:aws:greengrass:us-west-2:394441032220:/greengrass/groups/01a24b59-82af-4619-99f6-c2b3fffa9458"
},
{
"LatestVersionArn": "arn:aws:greengrass:us-west-2:394441032220:/greengrass/groups/a4e67c91-8cbd-4265-a65d-103def8ae66d/versions/f939e585-6ab1-458f-81e5-f674dcd9d775",
"Name": "MyFirstGroup",
"LastUpdatedTimestamp": "2019-12-05T05:09:22.801Z",
"LatestVersion": "f939e585-6ab1-458f-81e5-f674dcd9d775",
"CreationTimestamp": "2019-12-05T05:09:22.801Z",
"Id": "a4e67c91-8cbd-4265-a65d-103def8ae66d",
"Arn": "arn:aws:greengrass:us-west-2:394441032220:/greengrass/groups/a4e67c91-8cbd-4265-a65d-103def8ae66d"
}
]

}

aws greengrass reset-deployments --group-id GroupId --force

[ec2-user@ip-172-31-7-149 .aws]$ aws greengrass list-group-versions --group-id a4e67c91-8cbd-4265-a65d-103def8ae66d

pip install greengrasssdk

Sunday 8 December 2019

install pip in ec2 instance

[ec2-user@ip-172-31-11-0 Module6]$ pip intall boto3 -t /home/ec2-user/greenTest/Module6
-bash: pip: command not found

sudo: pip: command not found
[ec2-user@ip-172-31-7-149 ~]$ sudo easy_install pip

- Please intall python at first

[ec2-user@ip-172-31-11-0 Module6]$ sudo yum install python3

[ec2-user@ip-172-31-11-0 Module6]$ curl -O https://bootstrap.pypa.io/get-pip.py
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 1734k 100 1734k 0 0 13.4M 0 --:--:-- --:--:-- --:--:-- 13.3M
[ec2-user@ip-172-31-11-0 Module6]$ ls -al
total 1740
drwxrwxr-x 3 ec2-user ec2-user 46 Dec 9 07:04 .
drwxrwxr-x 6 ec2-user ec2-user 4096 Dec 9 06:59 ..
drwxrwxr-x 2 ec2-user ec2-user 30 Dec 9 07:00 car_aggregator
-rw-rw-r-- 1 ec2-user ec2-user 1775835 Dec 9 07:04 get-pip.py
[ec2-user@ip-172-31-11-0 Module6]$ python3 get-pip.py --user
Collecting pip
Downloading https://files.pythonhosted.org/packages/00/b6/9cfa56b4081ad13874b0c6f96af8ce16cfbc1cb06bedf8e9164ce5551ec1/pip-19.3.1-py2.py3-none-any.whl (1.4MB)
|████████████████████████████████| 1.4MB 5.5MB/s
Collecting wheel
Downloading https://files.pythonhosted.org/packages/00/83/b4a77d044e78ad1a45610eb88f745be2fd2c6d658f9798a15e384b7d57c9/wheel-0.33.6-py2.py3-none-any.whl
Installing collected packages: pip, wheel
Successfully installed pip-19.3.1 wheel-0.33.6
[ec2-user@ip-172-31-11-0 Module6]$ ^C

ec2 python version change

[ec2-user@ip-172-31-7-149 lambda]$ python --version
Python 2.7.16

[ec2-user@ip-172-31-7-149 lambda]$ sudo yum list | grep python3

[ec2-user@ip-172-31-7-149 lambda]$ sudo yum install python3 python3-pip

[ec2-user@ip-172-31-7-149 lambda]$ sudo python --version
Python 2.7.16
[ec2-user@ip-172-31-7-149 lambda]$ alias python=python3
[ec2-user@ip-172-31-7-149 lambda]$ python --version
Python 3.7.4