configure-awslogs.sh

#!/bin/bash 

add_log()
{   
	LOG_FILE_VAR_NAME=AWS_LOGFILE$1 
	LOG_FILE=${!LOG_FILE_VAR_NAME}
	if [ "$LOG_FILE" == "" ]; then
		return 0
	fi

	LOG_FORMAT_VAR_NAME=AWS_LOGFORMAT$1 
	LOG_FORMAT=${!LOG_FORMAT_VAR_NAME:-"%d/%b/%Y:%H:%M:%S %z"}
	
	DURATION_VAR_NAME=AWS_DURATION$1 
	DURATION=${!DURATION_VAR_NAME:-"5000"}
	
	GROUP_NAME_VAR_NAME=AWS_GROUPNAME$1 
	GROUP_NAME=${!GROUP_NAME_VAR_NAME:-"nginx-server"}
	
	LOG_STREAM_NAME_VAR_NAME=AWS_LOG_STREAM_NAME$1 
	LOG_STREAM_NAME=${!LOG_STREAM_NAME_VAR_NAME:-'{instance_id}'}
	
	LOG_GROUP_RETENTION_POLICY_DAYS_VAR_NAME=AWS_LOG_GROUP_RETENTION_POLICY_DAYS$1 
	LOG_GROUP_RETENTION_POLICY_DAYS=${!LOG_GROUP_RETENTION_POLICY_DAYS_VAR_NAME:-'90'}
	
	MULTI_LINE_START_PATTERN_VAR_NAME=AWS_MULTI_LINE_START_PATTERN$1
	MULTI_LINE_START_PATTERN=${!MULTI_LINE_START_PATTERN_VAR_NAME:-'^[^\s]'}
	
cat >> /var/awslogs/etc/awslogs.conf <<EOF
[${LOG_FILE}]
datetime_format = ${LOG_FORMAT}
file = ${LOG_FILE}
buffer_duration = ${DURATION}
log_stream_name = ${LOG_STREAM_NAME}
initial_position = start_of_file
log_group_name = ${GROUP_NAME}
multi_line_start_pattern = ${MULTI_LINE_START_PATTERN}

EOF

	# Trying to create the log group so we can set a policy on it. It will simply fail if the 
	# log group already exists
	aws logs create-log-group --log-group-name ${GROUP_NAME}

	# Set retention policy
	aws logs put-retention-policy --log-group-name ${GROUP_NAME} --retention-in-days ${LOG_GROUP_RETENTION_POLICY_DAYS}
	
	return 1
	
}

add_log

result=1
index=1

while [ "$result" = "1" ]
do
	add_log $index
   	result=$?
   	index=`expr $index + 1`
done