i am using digitalocean and trying to install and start tomcat on ubuntu but unfortunately i can not do it. (created new droplets and tried 10 times)
1GB Ram 30GB SSD Disk Amsterdam 2 Ubuntu 14.04 x64
When i start tomcat, it says "Tomcat started". But i can not access page from browser. and ./shutdown.sh returns error.
What can be the problem ?
I noticed something now. While i am writing this question, tomcat page is displayed. it took 28 minutes to display the page
catalina.out says: INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [1,718,769] milliseconds.
Here are my installation steps (These steps works on different vps but doesn't work on digitalocean droplets):
Install oracle jdk
sudo apt-get install python-software-properties
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer
sudo apt-get install oracle-java7-set-default
java -version
java version "1.7.0_72"
Java(TM) SE Runtime Environment (build 1.7.0_72-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.72-b04, mixed mode)
Set java path
sudo nano /etc/environment
JAVA_HOME="/usr/lib/jvm/java-7-oracle"
source /etc/environment
wget http://ftp.itu.edu.tr/Mirror/Apache/tomcat/tomcat-7/v7.0.56/bin/apache-tomcat-7.0.56.tar.gz
tar xvzf apache-tomcat-7.0.56.tar.gz
mv apache-tomcat-7.0.56/ apache-tomcat-7.0.56-server-1/
Start Tomcat
./startup.sh
Using CATALINA_BASE: /usr/local/apache-tomcat-7.0.56-server-1
Using CATALINA_HOME: /usr/local/apache-tomcat-7.0.56-server-1
Using CATALINA_TMPDIR: /usr/local/apache-tomcat-7.0.56-server-1/temp
Using JRE_HOME: /usr/lib/jvm/java-7-oracle/jre
Using CLASSPATH: /usr/local/apache-tomcat-7.0.56-server-1/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.56-server-1/bin/tomcat-juli.jar
Tomcat started.
Checkout Port 8080
netstat -ln
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp6 0 0 :::8009 :::* LISTEN
tcp6 0 0 :::8080 :::* LISTEN
tcp6 0 0 :::22 :::* LISTEN
Checkout process
ps -ef | grep tomcat
root 2825 1 1 14:23 pts/0 00:00:03 /usr/lib/jvm/java-7-oracle/jre/bin/java -Djava.util.logging.config.file=/usr/local/apache-tomcat-7.0.56-server-1/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/local/apache-tomcat-7.0.56-server-1/endorsed -classpath /usr/local/apache-tomcat-7.0.56-server-1/bin/bootstrap.jar:/usr/local/apache-tomcat-7.0.56-server-1/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/apache-tomcat-7.0.56-server-1 -Dcatalina.home=/usr/local/apache-tomcat-7.0.56-server-1 -Djava.io.tmpdir=/usr/local/apache-tomcat-7.0.56-server-1/temp org.apache.catalina.startup.Bootstrap start
Open web site at port 8080 http://5.101.107.56:8080/
Page is waiting... [content is displayed after 28 minute or more]
Try to shutdown tomcat if content is not displayed yet (before tomcat starts properly).
./shutdown.sh
SEVERE: Could not contact localhost:8005. Tomcat may not be running.
Oct 17, 2014 2:40:29 PM org.apache.catalina.startup.Catalina stopServer
SEVERE: Catalina.stop:
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSoc
Checkout logs
catalina.out
Oct 17, 2014 2:31:47 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Oct 17, 2014 2:31:47 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 1492 ms
Oct 17, 2014 2:31:47 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Oct 17, 2014 2:31:47 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.56
Oct 17, 2014 2:31:47 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.56-server-1/webapps/host-manager
I also installed nginx and navigate to http://5.XXX.XXX.XX/
nginx welcome page is opened immediately
I checked catalina.out when i see the page in browser, it says:
Oct 17, 2014 2:31:47 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /usr/local/apache-tomcat-7.0.56-server-1/webapps/host-manager
Oct 17, 2014 3:00:27 PM org.apache.catalina.util.SessionIdGenerator createSecureRandom
INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took **[1,718,769] milliseconds.**
Memory:
total used free shared buffers cached
Mem: 1017912 849512 168400 332 18780 688468
Replacing securerandom.source=file:/dev/urandom
with securerandom.source=file:/dev/./urandom
in $JAVA_PATH/jre/lib/security/java.security
has solved my problem.
Even when file:/dev/urandom
is specified, JRE will still use /dev/random
for SHA1PRNG (see bug JDK-4705093):
In SHA1PRNG, there is a SeedGenerator which does various things depending on the configuration.
If java.security.egd or securerandom.source point to "file:/dev/random" or "file:/dev/urandom", we will use NativeSeedGenerator, which calls super() which calls SeedGenerator.URLSeedGenerator(/dev/random). (A nested class within SeedGenerator.) The only things that changed in this bug was that urandom will also trigger use of this code path.
If those properties point to another URL that exists, we'll initialize SeedGenerator.URLSeedGenerator(url). This is why "file:///dev/urandom", "file:/./dev/random", etc. will work.
From Wikipedia on /dev/random:
In this implementation, the generator keeps an estimate of the number of bits of noise in the entropy pool. From this entropy pool random numbers are created. When read, the /dev/random device will only return random bytes within the estimated number of bits of noise in the entropy pool. /dev/random should be suitable for uses that need very high quality randomness such as one-time pad or key generation.
When the entropy pool is empty, reads from /dev/random will block until additional environmental noise is gathered. The intent is to serve as a cryptographically secure pseudorandom number generator, delivering output with entropy as large as possible. This is suggested for use in generating cryptographic keys for high-value or long-term protection.
Environmental noise?
The random number generator gathers environmental noise from device drivers and other sources into an entropy pool. The generator also keeps an estimate of the number of bits of noise in the entropy pool. From this entropy pool random numbers are created.
That means in practice, it’s possible to block tomcat for an unknown amount of time.