Monitoring Nginx in a Kubernetes

Step 1: Add the following line next to the From line in the Dockerfile that builds Nginx.

RUN apt-get update && \
apt-get install unzip -y && \
apt-get install curl -y && \
apt-get clean

RUN mkdir /usr/local/Applicare
WORKDIR /usr/local/Applicare
RUN curl $CONTROLLER_PROTOCOL://$CONTROLLER_IP:$CONTROLLER_PORT/applicare/standalone?filename=ApplicareSingleAgentLinux >ApplicareSingleAgentLinux.zip
RUN unzip ApplicareSingleAgentLinux.zip
RUN ["rm", "-frv", "/usr/local/Applicare/ApplicareSingleAgentLinux.zip"]
COPY startAgent.sh /usr/local/Applicare/agentscripts/startAgent.sh
COPY start_nginx.sh /usr/local/Applicare/start_nginx.sh
RUN chmod -R 755 /usr/local/Applicare
WORKDIR /usr/local/Applicare
CMD ["./start_nginx.sh"]

Replace the below values in the above command

CONTROLLER_PROTOCOL -> http (or) https

CONTROLLER_IP -> Applicare Controller IP

CONTROLLER_PORT -> Applicare Controller Port

Step 2: Create a file named start_nginx.sh with the following content:

#!/bin/bash

# Start Nginx in the background
nginx -g "daemon off;" &

# Start our Agent
/usr/local/Applicare/startAgent.sh

Step 3: Create a file named startAgent.sh with the content below.

#!/bin/sh
SERVER_NAME=`hostname`_sa

export SERVER_NAME

if [ -z "$ARCTURUS_HOME" ]; then

ARCTURUS_HOME="/usr/local/Applicare"

fi

export ARCTURUS_HOME

JAVA_HOME_PATH=$JAVA_HOME

INBUILD_JAVA_PATH=$ARCTURUS_HOME/jre

export INBUILD_JAVA_PATH

if [[ $(uname -s) == "Darwin" ]]; then

  JAVA_HOME_PATH="$ARCTURUS_HOME/jre/mac/zulu-8_jre/Contents/Home"

else

  JAVA_HOME_PATH="$ARCTURUS_HOME/jre/linux/jre"

fi

#export JAVA_HOME

export JAVA_HOME_PATH

JAVA_OPTS="-noverify -Xmx1024m -Dserver.name=$SERVER_NAME -javaagent:$ARCTURUS_HOME/applicare-db-aspects.jar=verbosity=0,logfile=false,norestart-intellitrace=false -Darcturus_home=$ARCTURUS_HOME -XX:HeapDumpPath=/dev/null -Djava.library.path=.:$ARCTURUS_HOME/bin -Dapplicare.standalone=true"

export JAVA_OPTS


EXECUTABLE_NAME=$ARCTURUS_HOME/AgentStartHelper.jar

export EXECUTABLE_NAME


if [ -d "$JAVA_HOME_PATH/bin" ] ; then

 "$JAVA_HOME_PATH/bin"/java -jar $JAVA_OPTS $EXECUTABLE_NAME

else

 java -jar $JAVA_OPTS $EXECUTABLE_NAME

fi

Step 4: In the nginx.conf file, make the following changes:

a.) Comment out the existing log_format directive and add the new log_format as shown below.

log_format  main  '$remote_addr - $remote_user $time_iso8601 [$request_time] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

b.) Uncomment the access_log line if it is already commented.

c.) Add the below lines inside the server module

location /nginx-status {
stub_status on;
allow 127.0.0.1;
}

Step 5: Add the following line to the container specification in the YAML file that starts Nginx on Kubernetes.

hostname: <hostname>

Replace <hostname> with the name which we need to add the agent in Applicare.

Step 6: Log in to the Applicare console, go to the Overview menu, select the newly added agent, and click the Edit button.

Step 7: Enable the "Add Nginx Configuration" checkbox and  add the  below value.

1. Log file path -  <access log file location>

2. Nginx Host - 127.0.0.1

3. Nginx Port - <Nginx_Port>

4. Nginx Protocol - http (or) https

Click the update button to save.