Add fault-tolerant file buffers for logs

.gitignore

@@ -1 +1,2 @@
 .vagrant
+tmp

README.md

@@ -1,22 +1,21 @@
 # Graylog Demo
 
 
-This is a demonstration of Graylog, a centralized log management system featuring a shell provisioned CentOS 7 Vagrant box. To illustrate various log collection methods `httpd`, `rsyslog` and `docker` are installed and a simple WordPress instance is deployed via Docker Compose. Log collection incorporates Fluentd to ship logs into a Graylog instance from containers, the syslog, and arbitrary filesystem logs.
+This is a demonstration of Graylog, a centralized log management system featuring a shell provisioned CentOS 7 Vagrant box. To illustrate various log collection methods `httpd`, `rsyslog` and `docker` are installed and a simple WordPress instance is deployed via Docker Compose. Log collection incorporates td-agent (a version of Fluentd) to ship logs into a Graylog instance from containers, the syslog, and arbitrary filesystem logs.
 
 This demonstration assumes you are familiar with using Vagrant + VirtualBox to automate the installation of virtual machines, although you can reference the Vagrantfile's shell provisioning sections to manually set up a system if you so desire. Please install these prerequisites before attempting the quick start below.
 
 #### Notes about setup
-- This demonstration uses Traefik for routing and the [xip.io](http://xip.io/) wildcard DNS service. If DNS fails to resolve for whatever reason you may want to set the domains to the IP inside your operating system's hosts file, e.g.
+- This demonstration uses Traefik for some routing and the [xip.io](http://xip.io/) wildcard DNS service. If DNS fails to resolve for whatever reason you may want to set the domains to the IP inside your operating system's hosts file, e.g.
 
 ```
 172.28.128.30   traefik.172.28.128.30.xip.io
 172.28.128.30   graylog.172.28.128.30.xip.io
-172.28.128.30   wordpress.172.28.128.30.xip.io
 ```
 
-- Vagrant will provision a virtual machine with a static private Class B address (specifically `172.28.128.30`). If you would like to change this IP address to something different you will need to change the `PRIVATE_NET_IP` variable and the scripted API calls in the `Vagrantfile`. You'll also need to modify the few wildcard DNS references to it in the two `docker-compose.yml` files.
+- Vagrant will provision two virtual machines with two consecutive private Class B addresses (starting from `172.28.128.30`). If you would like to change this base IP address to something different you will need to look through the project and find various references. Unfortunately, this is not a simple variable you can set for the entire project.
 
-- Vagrant is set to allocate 4 cores and 4 GB of RAM, you may need to adjust this for your machine if necessary.
+- Vagrant is set to allocate 4 cores and 4 GB of RAM per machine (this is 8 cores / 8 GB of memory total) you may need to adjust this for your machine if necessary.
 
 - After deploying, Graylog takes the longest to become available and it may take 30 seconds to a few minutes to bring it up depending on your machine.
 
@@ -26,7 +25,7 @@ This demonstration assumes you are familiar with using Vagrant + VirtualBox to a
 
 
 ## Quick Start
-_This section assumes you will be using the default `172.28.128.30` IP address_
+_This section assumes you will be using the default `172.28.128.30` and `172.28.128.31` IP addresses_
 1. Clone the repository and navigate inside its directory
 2. Create and provision the VM using `vagrant up`
 3. Navigate to [http://graylog.172.28.128.30.xip.io:8080/](http://graylog.172.28.128.30.xip.io:8080/)
@@ -36,13 +35,13 @@ _This section assumes you will be using the default `172.28.128.30` IP address_
 7. Press the start button on the top right to start updating the feed every second
 
 #### Docker Test
-- Generate Docker logs by simply navigating to the WordPress install page [http://wordpress.172.28.128.30.xip.io:8080/](http://wordpress.172.28.128.30.xip.io:8080/)
+- Generate Docker logs by simply navigating to the WordPress install page: [http://172.28.128.31:8080](http://172.28.128.31:8080/wp-admin/install.php)
 
 #### File Test
-- Collect logs from Apache's `access_log` file by going to [http://172.28.128.30/](http://172.28.128.30/)
+- Collect logs from Apache's `access_log` file by going to [http://172.28.128.31/](http://172.28.128.31/)
 
 #### Syslog Test
-1. Go back to the terminal inside the project's directory and type `vagrant ssh`
+1. Go back to the terminal inside the project's directory and type `vagrant ssh systems` or `vagrant ssh graylog`
 2. You can test Syslog collection with `logger` e.g. `logger -t test Hello world` (or just wait for some to appear)
 
 ### Copyrights and Licenses

Vagrantfile

@@ -1,18 +1,27 @@
 # vi: set ft=ruby :
 
-PRIVATE_NET_IP = "172.28.128.30"
+PRIVATE_NET_IP = "172.28.128."
 
 Vagrant.configure("2") do |config|
-  config.vm.box = "centos/7"
-  config.vm.network "private_network", ip: PRIVATE_NET_IP
-  config.vm.synced_folder ".", "/vagrant", type: "nfs"
 
-  config.vm.provider "virtualbox" do |vbox|
+  vmservers = ["graylog", "systems"]
+  last_octet = 30
+
+  vmservers.each do |server|
+    config.vm.define "#{server}" do |node|
+      node.vm.box = "centos/7"
+      node.vm.hostname = "#{server}"
+      node.vm.network "private_network", ip: PRIVATE_NET_IP + last_octet.to_s
+      node.vm.synced_folder ".", "/vagrant", type: "nfs"
+      last_octet = last_octet + 1
+
+      node.vm.provider "virtualbox" do |vbox|
         vbox.memory = 4096
         vbox.cpus = 4
       end
 
-  config.vm.provision "shell", inline: <<-SHELL
+      # Common provision
+      node.vm.provision "shell", inline: <<-SHELL
 
         # Set SELinux to permissive
         setenforce 0
@@ -36,51 +45,60 @@ Vagrant.configure("2") do |config|
         # Convenience
         yum install -y vim
 
-    # Install jq
-    yum install -y epel-release
-    yum install -y jq
-
-    # Install apache
-    yum install -y httpd
-    systemctl start httpd
-    systemctl -q enable httpd
-
         # Install rsyslog
         yum install -y rsyslog
         systemctl start rsyslog
         systemctl -q enable rsyslog
 
-    # Install td-agent
-    cp /vagrant/td-agent.repo /etc/yum.repos.d/
-    yum check-update
-    yum install -y td-agent
-    td-agent-gem install fluent-plugin-gelf-hs gelf
-    cp /vagrant/td-agent.conf /etc/td-agent/td-agent.conf
-    mkdir /var/log/containers
-    chown -R td-agent:td-agent /var/log/containers
-    chmod -R 755 /var/log
-    systemctl restart td-agent
-    systemctl -q enable td-agent
-
         # Add rsyslog forwarding option if it does not exist
         if ! grep -q "127.0.0.1:5140" /etc/rsyslog.conf; then
           echo "*.* @127.0.0.1:5140" >> /etc/rsyslog.conf
           systemctl restart rsyslog
         fi
 
+        # Setup TLS
+        if [ ! -f /vagrant/tmp/ca_key.pem ]; then
+          echo "Generating TLS certificates..."
+          cd /vagrant/tmp
+          openssl req -newkey rsa:4096 \
+                      -x509 \
+                      -sha256 \
+                      -days 3650 \
+                      -nodes \
+                      -out ca_cert.pem \
+                      -keyout ca_key.pem \
+                      -subj "/C=US/ST=Local/L=Local/O=Org/OU=IT/CN=example.com" \
+                      2> /dev/null
+        fi
+
+        # Install td-agent
+        cp /vagrant/td-agent.repo /etc/yum.repos.d/
+        yum check-update
+        yum install -y td-agent
+        td-agent-gem install fluent-plugin-gelf-hs gelf
+        systemctl -q enable td-agent
+
       SHELL
 
-  # Install newest docker-compose
+      # Commmon provision: install docker-compose
-  config.vm.provision "shell", path: "install-compose.sh"
+      node.vm.provision "shell", path: "install-compose.sh"
 
-  # Start compose services and add default input
+      # Graylog specific provision
-  config.vm.provision "shell", inline: <<-SHELL
+      if server == "graylog"
-    # Bring up containers
+        node.vm.provision "shell", inline: <<-SHELL
+
+          cp /vagrant/td-agent-server.conf /etc/td-agent/td-agent.conf
+          mkdir -p /var/log/graylog_buffer
+          chown -R td-agent:td-agent /var/log/graylog_buffer
+          systemctl restart td-agent
+
+          # Install jq
+          yum install -y epel-release
+          yum install -y jq
+
+          # Start Graylog
           cd /vagrant
           /usr/local/bin/docker-compose up -d 2> /dev/null
-    cd /vagrant/wordpress
-    /usr/local/bin/docker-compose up -d 2> /dev/null
-    cd /vagrant
 
           # Wait 120 seconds for Graylog to come online
           SECONDS=0
@@ -130,6 +148,31 @@ Vagrant.configure("2") do |config|
               -u admin:admin \
               "http://graylog.172.28.128.30.xip.io:8080/api/system/inputs" \
               -d @GELFTCPInput.json
+
+        SHELL
+
+      elsif server == "systems"
+        node.vm.provision "shell", inline: <<-SHELL
+
+          # Install apache
+          yum install -y httpd
+          systemctl start httpd
+          systemctl -q enable httpd
+
+          # Configure td-agent
+          cp /vagrant/td-agent.conf /etc/td-agent/td-agent.conf
+          mkdir -p /var/log/containers /var/log/fluentd_buffer
+          chown -R td-agent:td-agent /var/log/containers /var/log/fluentd_buffer
+          chmod -R 755 /var/log
+          systemctl restart td-agent
+
+          # Bring up WordPress test containers
+          cd /vagrant/wordpress
+          /usr/local/bin/docker-compose up -d 2> /dev/null
+
         SHELL
 
       end
+    end
+  end
+end

docker-compose.yml

@@ -3,7 +3,7 @@ version: '3.7'
 services:
 
   traefik:
-    image: traefik:2.1.4
+    image: traefik:2.2.1
     restart: always
     networks:
       - traefik-net
@@ -24,15 +24,27 @@ services:
       - "traefik.enable=true"
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock:ro
+    logging:
+      driver: "fluentd"
+      options:
+       fluentd-address: "tcp://127.0.0.1:24224"
+       fluentd-async-connect: "true"
+       tag: traefik
 
   mongo:
-    image: mongo:4.2.2
+    image: mongo:4.2.8
     restart: always
     networks:
       - graylog
+    logging:
+      driver: "fluentd"
+      options:
+       fluentd-address: "tcp://127.0.0.1:24224"
+       fluentd-async-connect: "true"
+       tag: graylog.db
 
   elasticsearch:
-    image: elasticsearch:6.8.6
+    image: elasticsearch:6.8.10
     restart: always
     environment:
       - http:host=0.0.0.0
@@ -45,9 +57,15 @@ services:
         hard: -1
     networks:
       - graylog
+    logging:
+      driver: "fluentd"
+      options:
+       fluentd-address: "tcp://127.0.0.1:24224"
+       fluentd-async-connect: "true"
+       tag: graylog.elasticsearch
 
   graylog:
-    image: graylog/graylog:3.2.2
+    image: graylog/graylog:3.3.2
     restart: always
     environment:
       - GRAYLOG_PASSWORD_SECRET=LongerPassword01
@@ -76,6 +94,12 @@ services:
       - 12201:12201
       # GELF UDP
       - 12201:12201/udp
+    logging:
+      driver: "fluentd"
+      options:
+       fluentd-address: "tcp://127.0.0.1:24224"
+       fluentd-async-connect: "true"
+       tag: graylog
 
 networks:
   traefik-net:

td-agent-server.conf

@@ -0,0 +1,42 @@
+<source>
+  @type forward
+  port 2514
+  <transport tls>
+    version TLSv1_2
+    insecure true
+    cert_path /vagrant/tmp/ca_cert.pem
+    private_key_path /vagrant/tmp/ca_key.pem
+  </transport>
+</source>
+
+<source>
+  @type forward
+  port 24224
+</source>
+
+<source>
+  @type syslog
+  port 5140
+  tag system.local
+</source>
+
+<filter httpd.access>
+  @type parser
+  key_name message
+  reserve_data true
+  <parse>
+    @type apache2
+  </parse>
+</filter>
+
+<match **>
+  @type gelf
+  protocol tcp
+  host localhost
+  port 12201
+  <buffer>
+    @type file
+    path /var/log/graylog_buffer
+    flush_interval 0s
+  </buffer>
+</match>

td-agent.conf

@@ -15,7 +15,7 @@
   pos_file /var/log/td-agent/access_log.pos
   tag httpd.access
   <parse>
-    @type apache2
+    @type none
   </parse>
 </source>
 
@@ -26,9 +26,14 @@
     path /var/log/containers/${tag}
     append true
     <buffer tag>
-      timekey 5s
+      @type file
-      flush_mode immediate
+      path /var/log/containers/buffer
+      flush_interval 0s
     </buffer>
+    <format>
+      @type single_value
+      message_key log
+    </format>
   </store>
   <store>
     @type rewrite_tag_filter
@@ -41,9 +46,17 @@
 </match>
 
 <match **>
-  @type gelf
+  @type forward
-  protocol tcp
+  transport tls
-  host localhost
+  tls_cert_path /vagrant/tmp/ca_cert.pem
-  port 12201
+  <server>
-  flush_interval 5s
+    name example.com
+    host 172.28.128.30
+    port 2514
+  </server>
+  <buffer>
+    @type file
+    path /var/log/fluentd_buffer
+    flush_interval 0s
+  </buffer>
 </match>

wordpress/docker-compose.yml

@@ -11,26 +11,25 @@ services:
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: Password1
       MYSQL_RANDOM_ROOT_PASSWORD: '1'
-    networks:
+    logging:
-      - default
+      driver: "fluentd"
+      options:
+       fluentd-address: "tcp://127.0.0.1:24224"
+       fluentd-async-connect: "true"
+       tag: devel.kris.db
 
   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     restart: always
+    ports:
+      - 8080:80
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: Password1
       WORDPRESS_DB_NAME: wordpress
-    networks:
-      - default
-      - traefik-net
-    labels:
-      - "traefik.http.routers.wordpress.rule=Host(`wordpress.172.28.128.30.xip.io`)"
-      - "traefik.docker.network=vagrant_traefik-net"
-      - "traefik.enable=true"
     logging:
       driver: "fluentd"
       options:
@@ -38,10 +37,5 @@ services:
        fluentd-async-connect: "true"
        tag: devel.kris
 
-networks:
-  traefik-net:
-    external:
-      name: vagrant_traefik-net
-
 volumes:
   db_data: {}