##### Kapitel 13

### Web-Worker Definition

<VirtualHost 172.31.31.111:80>
	DocumentRoot /usr/local/apache2/htdocs-webworkerX.sv
	ServerName webworker1.sv
	DirectoryIndex index.php index.html
	CustomLog logs/webworker1-access.log combined
	ErrorLog logs/webworker1-error.log
</VirtualHost>

<VirtualHost 172.31.31.112:80>
	DocumentRoot /usr/local/apache2/htdocs-webworkerX.sv
	ServerName webworker2.sv
	DirectoryIndex index.php index.html
	CustomLog logs/webworker2-access.log combined
	ErrorLog logs/webworker2-error.log
</VirtualHost>

### Loadbalancer pen

# % pen -f -l /tmp/pen.log 172.31.31.113:8888 172.31.31.111:80 172.31.31.112:80

### Balancer plus Manager

LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
LoadModule slotmem_shm_module modules/mod_slotmem_shm.so
LoadModule lbmethod_byrequests_module modules/mod_lbmethod_byrequests.so
#LoadModule lbmethod_bytraffic_module modules/mod_lbmethod_bytraffic.so
#LoadModule lbmethod_bybusyness_module modules/mod_lbmethod_bybusyness.so
#LoadModule lbmethod_heartbeat_module modules/mod_lbmethod_heartbeat.so

# BalancerPersist On

<VirtualHost 172.31.31.105:80>
	ServerName revproxy-manager.sv

	<Location /balancer-manager>
		SetHandler balancer-manager
		Require ip 172.31.31.0/24
	</Location>

	<Proxy balancer://webworker/>
		BalancerMember http://172.31.31.111
		BalancerMember http://172.31.31.112
	</Proxy>
		
	ProxyPass /balancer-manager !
	ProxyPass / balancer://webworker/

	CustomLog logs/revproxy-manager_access.log combined
	ErrorLog logs/revproxy-manager_error.log
</VirtualHost>

### Weiteres: Balancer Sticky

# Testen (mehrfach hintereinander!) mit
# % curl -i                                http://revproxy-sticky.sv
# % curl -i --cookie "ROUTEID=.w2; path=/" http://revproxy-sticky.sv

#LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
#LoadModule slotmem_shm_module modules/mod_slotmem_shm.so
#LoadModule lbmethod_byrequests_module modules/mod_lbmethod_byrequests.so
#LoadModule lbmethod_bytraffic_module modules/mod_lbmethod_bytraffic.so
#LoadModule lbmethod_bybusyness_module modules/mod_lbmethod_bybusyness.so
#LoadModule lbmethod_heartbeat_module modules/mod_lbmethod_heartbeat.so

# BalancerPersist On

<VirtualHost 172.31.31.105:80>
	ServerName revproxy-sticky.sv

	Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/" env=BALANCER_ROUTE_CHANGED

	<Location /balancer-manager>
		SetHandler balancer-manager
		Require ip 172.31.31.0/24
	</Location>

	<Proxy balancer://webworker/>
		BalancerMember http://172.31.31.111 route=w1
		BalancerMember http://172.31.31.112 route=w2

		ProxySet stickysession=ROUTEID
	</Proxy>
		
	ProxyPass /balancer-manager !
	ProxyPass / balancer://webworker/

        CustomLog logs/revproxy-sticky_access.log combined
        ErrorLog logs/revproxy-sticky_error.log
</VirtualHost>

### Tomcat Loadbalancer mit Sticky-Sessions

<VirtualHost 172.31.31.106:80>
	ServerName tomcat-lb.sv

	DocumentRoot /usr/share/tomcat9-examples/

	<Proxy balancer://tomcat-ajp>
		BalancerMember ajp://localhost:8009 route=t0
		BalancerMember ajp://192.168.1.101:8009 route=t1
		BalancerMember ajp://192.168.1.102:8009 route=t2 status=+H
		BalancerMember ajp://192.168.1.103:8009 route=t3 status=+R
		ProxySet stickysession=JSESSIONID|jsessionid scolonpathdelim=On
	</Proxy>
	<Proxy balancer://tomcat-ws>
		BalancerMember ws://localhost:8080 route=t0
		BalancerMember ws://192.168.1.101:8080 route=t2
		BalancerMember ws://192.168.1.102:8080 route=t3 status=+H
		BalancerMember ws://192.168.1.103:8080 route=t4 status=+R
		ProxySet stickysession=JSESSIONID|jsessionid scolonpathdelim=On
	</Proxy>

	RewriteEngine On
	RewriteRule ^/examples/(.*)\.jsp(x?)$  balancer://tomcat-ajp/examples/$1.jsp$2  [P,L]

	RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
	RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-d
	RewriteRule ^/examples/websocket/(.*)$  balancer://tomcat-ws/examples/websocket/$1  [P,L]

	RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
	RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-d
	RewriteRule ^/examples/(.*)$  ajp://tomcat-ajp/examples/$1  [P,L]

	<Directory /usr/share/tomcat9-examples/>
		Require all granted
		Options Indexes
	</Directory>

	CustomLog logs/tomcat-lb_access.log combined
	ErrorLog logs/tomcat-lb_error.log
</VirtualHost>