Postgresql Auto-fallback (initial)

common.py

DATABASES = {
"follower": {
        "ENGINE": "django.db.backends.postgresql",
        "NAME": "follower",
        "USER": "root",
        "HOST": "54.34.65.24",
        "PORT": "3306",
    },
"default": {
        "ENGINE": "django.db.backends.postgresql",
        "NAME": "application",
        "USER": "root",
        "HOST": "54.34.65.23",
        "PORT": "3306",
    },
}  
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Replace the target database in common.py (try migrating database settings to local.py)

sed -Ei 's/psql/psql-slave/g' psql_setting    #Master to Slave

sed -Ei 's/psql-slave/psql/g' psql_setting    #Slave to Master

# Exact match:
sed -i 's/\<$basename\>/${basename}_yesterday/g' file.txt


https://stackoverflow.com/questions/26608906/django-multiple-databases-fallback-to-master-if-slave-is-down