jitensachdeva

UPDATE (March 2020, thanks @ic): I don't know the exact AMI version but yum install docker now works on the latest Amazon Linux 2. The instructions below may still be relevant depending on the vintage AMI you are using.

Amazon changed the install in Linux 2. One no-longer using 'yum' See: https://aws.amazon.com/amazon-linux-2/release-notes/

Docker CE Install

sudo amazon-linux-extras install docker
sudo service docker start

jitensachdeva

--- a/ext/openssl/ossl_ssl.c
+++ b/ext/openssl/ossl_ssl.c
@@ -107,6 +107,18 @@
     OSSL_SSL_METHOD_ENTRY(TLSv1),
     OSSL_SSL_METHOD_ENTRY(TLSv1_server),
     OSSL_SSL_METHOD_ENTRY(TLSv1_client),
+#if defined(HAVE_TLSV1_2_METHOD) && defined(HAVE_TLSV1_2_SERVER_METHOD) && \
+        defined(HAVE_TLSV1_2_CLIENT_METHOD)
+    OSSL_SSL_METHOD_ENTRY(TLSv1_2),
+    OSSL_SSL_METHOD_ENTRY(TLSv1_2_server),

jitensachdeva

MySQL

Getting started:

• http://www.sqlteaching.com/
• https://www.codecademy.com/courses/learn-sql

Related tutorial: http://cd64.de/mysql-cli

SQL joins infografic: http://cd64.de/sql-joins

jitensachdeva

Rails Models

Generating models

$ rails g model User

Associations

belongs_to

has_one

jitensachdeva

Rails Migration

http://guides.rubyonrails.org/migrations.html

Migrations methods:

• add_column
• add_index
• change_column
• change_table
• create_table
• drop_table