David Ghedini – Page 3 – Tomcat, PostgreSQL, and GIS

This post will cover installing Tomcat 9 on CentOS 8.

We’ll be using a bash script below, which is commented so you can see the steps.

We’ll install the latest stable release of Tomcat 9.x from Tomcat.org, as well as OpenJDK 8.

We’ll also update the tomcat-users.xml file to enable manager-gui and admin-gui roles and set their passwords to a random string.

Finally, we’ll create a service file and enable Tomcat to run as a systemd service.

#!/bin/bash -e
# Install Tomcat 9 on CentOS 8
# Save file as tomcat9-centos8.sh
# Usage: ./tomcat9-centos8.sh

# Main Function

function install_tomcat(){
  if [ $(grep -cm 1 tomcat /etc/passwd) -eq 0 ]; then
    useradd -m tomcat
  fi
  cd /home/tomcat

# Install latest stable Tomcat 9

  if [ ! -d apache-tomcat-${TOMCAT_VER} ]; then
    if [ ! -f apache-tomcat-${TOMCAT_VER}.tar.gz ]; then
      wget http://www.us.apache.org/dist/tomcat/tomcat-9/v${TOMCAT_VER}/bin/apache-tomcat-${TOMCAT_VER}.tar.gz
    fi
    tar xzf apache-tomcat-${TOMCAT_VER}.tar.gz
    chown -R tomcat:tomcat apache-tomcat-${TOMCAT_VER}
    rm -rf apache-tomcat-${TOMCAT_VER}.tar.gz
  fi

# Add CATALINA_HOME to environment

  if [ $(grep -m 1 -c CATALINA_HOME /etc/environment) -eq 0 ]; then
    cat &gt;&gt;/etc/environment &lt;&lt;EOF
export CATALINA_HOME=/home/tomcat/apache-tomcat-${TOMCAT_VER}
export CATALINA_BASE=/home/tomcat/apache-tomcat-${TOMCAT_VER}
EOF
  fi

  cat &gt;&gt;/home/tomcat/apache-tomcat-${TOMCAT_VER}/bin/setenv.sh &lt;&lt;CMD_EOF
CATALINA_PID="/home/tomcat/apache-tomcat-${TOMCAT_VER}/temp/tomcat.pid"
CMD_EOF

# Create passwords for manager-admin and manager-gui and update tomcat-users.xml file

  TOMCAT_MANAGER_PASS=$(&lt; /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c32);
  TOMCAT_ADMIN_PASS=$(&lt; /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c32);

  if [ $(grep -m 1 -c 'tomcat manager pass' /root/auth.txt) -eq 0 ]; then
    echo "tomcat manager pass: ${TOMCAT_MANAGER_PASS}" &gt;&gt; /root/auth.txt
  else
    sed -i.save "s/tomcat manager pass: .*/tomcat manager pass: ${TOMCAT_MANAGER_PASS}/" /root/auth.txt
  fi

  if [ $(grep -m 1 -c 'tomcat admin pass' /root/auth.txt) -eq 0 ]; then
    echo "tomcat admin pass: ${TOMCAT_ADMIN_PASS}" &gt;&gt; /root/auth.txt
  else
    sed -i.save "s/tomcat admin pass: .*/tomcat admin pass: ${TOMCAT_ADMIN_PASS}/" /root/auth.txt
  fi

  cat &gt;/home/tomcat/apache-tomcat-${TOMCAT_VER}/conf/tomcat-users.xml &lt;&lt;EOF
&lt;?xml version='1.0' encoding='utf-8'?&gt;
&lt;tomcat-users&gt;
&lt;role rolename="manager-gui" /&gt;
&lt;user username="manager" password="${TOMCAT_MANAGER_PASS}" roles="manager-gui" /&gt;

&lt;role rolename="admin-gui" /&gt;
&lt;user username="admin" password="${TOMCAT_ADMIN_PASS}" roles="manager-gui,admin-gui" /&gt;
&lt;/tomcat-users&gt;
EOF

  mkdir -p /home/tomcat/apache-tomcat-${TOMCAT_VER}/conf/Catalina/localhost/
  cat &gt;/home/tomcat/apache-tomcat-${TOMCAT_VER}/conf/Catalina/localhost/manager.xml &lt;&lt;EOF
&lt;Context privileged="true" antiResourceLocking="false" docBase="\${catalina.home}/webapps/manager"&gt;
  &lt;Valve className="org.apache.catalina.valves.RemoteAddrValve" allow="^.*\$" /&gt;
&lt;/Context&gt;
EOF

  chown -R tomcat:tomcat /home/tomcat

# Create the Tomcat Service

  cat &gt;/etc/systemd/system/tomcat.service &lt;&lt;CMD_EOF
[Unit]
Description=Tomcat

[Service]
Type=forking
User=tomcat
PIDFile=/home/tomcat/apache-tomcat-${TOMCAT_VER}/temp/tomcat.pid
ExecStart=/home/tomcat/apache-tomcat-${TOMCAT_VER}/bin/startup.sh
ExecStop=/home/tomcat/apache-tomcat-${TOMCAT_VER}/bin/shutdown.sh

[Install]
WantedBy=default.target
CMD_EOF

  chmod +x /etc/systemd/system/tomcat.service

  systemctl daemon-reload
  systemctl enable tomcat.service
  systemctl restart tomcat.service
}

# Install OpenJDK 8

function install_openjdk(){
  yum install -y java-1.8.0-openjdk-headless
}

# Create the auth.txt file to write passwords to

touch /root/auth.txt

# Preqs for clean install

yum -y install wget unzip tar

# Disable Selinux if enabled

setenforce 0

#Specific CentOS fixes
sed -i.save 's/enabled=0/enabled=1/' /etc/yum.repos.d/CentOS-PowerTools.repo

# Get latest Tomcat 9 version number

TOMCAT_VER=$(wget -qO- --no-check-certificate https://tomcat.apache.org/download-90.cgi | grep '&lt;a href="#9.' | cut -f2 -d'&gt;' | cut -f1 -d'&lt;' | head -n 1)
if [ -z "${TOMCAT_VER}" ]; then
  echo "Error: Failed to get tomcat version"; exit 1;
fi

# Execute install_openjdk and install_tomcat

install_openjdk;
install_tomcat;

# Save passwords to auth.txt and also display to user
echo "Passwords saved in /root/auth.txt"
cat /root/auth.txt

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#!/bin/bash -e

# Install Tomcat 9 on CentOS 8

# Save file as tomcat9-centos8.sh

# Usage: ./tomcat9-centos8.sh

# Main Function

function install_tomcat(){

if [ $(grep -cm 1 tomcat /etc/passwd) -eq 0 ]; then

useradd -m tomcat

cd /home/tomcat

# Install latest stable Tomcat 9

if [ ! -d apache-tomcat-${TOMCAT_VER} ]; then

if [ ! -f apache-tomcat-${TOMCAT_VER}.tar.gz ]; then

wget http://www.us.apache.org/dist/tomcat/tomcat-9/v${TOMCAT_VER}/bin/apache-tomcat-${TOMCAT_VER}.tar.gz

tar xzf apache-tomcat-${TOMCAT_VER}.tar.gz

chown -R tomcat:tomcat apache-tomcat-${TOMCAT_VER}

rm -rf apache-tomcat-${TOMCAT_VER}.tar.gz

# Add CATALINA_HOME to environment

if [ $(grep -m 1 -c CATALINA_HOME /etc/environment) -eq 0 ]; then

cat >>/etc/environment <<EOF

export CATALINA_HOME=/home/tomcat/apache-tomcat-${TOMCAT_VER}

export CATALINA_BASE=/home/tomcat/apache-tomcat-${TOMCAT_VER}

EOF

cat >>/home/tomcat/apache-tomcat-${TOMCAT_VER}/bin/setenv.sh <<CMD_EOF

CATALINA_PID="/home/tomcat/apache-tomcat-${TOMCAT_VER}/temp/tomcat.pid"

CMD_EOF

# Create passwords for manager-admin and manager-gui and update tomcat-users.xml file

TOMCAT_MANAGER_PASS=$(< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c32);

TOMCAT_ADMIN_PASS=$(< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c32);

if [ $(grep -m 1 -c 'tomcat manager pass' /root/auth.txt) -eq 0 ]; then

echo "tomcat manager pass: ${TOMCAT_MANAGER_PASS}" >> /root/auth.txt

else

sed -i.save "s/tomcat manager pass: .*/tomcat manager pass: ${TOMCAT_MANAGER_PASS}/" /root/auth.txt

if [ $(grep -m 1 -c 'tomcat admin pass' /root/auth.txt) -eq 0 ]; then

echo "tomcat admin pass: ${TOMCAT_ADMIN_PASS}" >> /root/auth.txt

else

sed -i.save "s/tomcat admin pass: .*/tomcat admin pass: ${TOMCAT_ADMIN_PASS}/" /root/auth.txt

cat >/home/tomcat/apache-tomcat-${TOMCAT_VER}/conf/tomcat-users.xml <<EOF

<?xml version='1.0' encoding='utf-8'?>

<tomcat-users>

</tomcat-users>

EOF

mkdir -p /home/tomcat/apache-tomcat-${TOMCAT_VER}/conf/Catalina/localhost/

cat >/home/tomcat/apache-tomcat-${TOMCAT_VER}/conf/Catalina/localhost/manager.xml <<EOF

</Context>

EOF

chown -R tomcat:tomcat /home/tomcat

# Create the Tomcat Service

cat >/etc/systemd/system/tomcat.service <<CMD_EOF

[Unit]

Description=Tomcat

[Service]

Type=forking

User=tomcat

PIDFile=/home/tomcat/apache-tomcat-${TOMCAT_VER}/temp/tomcat.pid

ExecStart=/home/tomcat/apache-tomcat-${TOMCAT_VER}/bin/startup.sh

ExecStop=/home/tomcat/apache-tomcat-${TOMCAT_VER}/bin/shutdown.sh

[Install]

WantedBy=default.target

CMD_EOF

chmod +x /etc/systemd/system/tomcat.service

systemctl daemon-reload

systemctl enable tomcat.service

systemctl restart tomcat.service

}

# Install OpenJDK 8

function install_openjdk(){

yum install -y java-1.8.0-openjdk-headless

}

# Create the auth.txt file to write passwords to

touch /root/auth.txt

# Preqs for clean install

yum -y install wget unzip tar

# Disable Selinux if enabled

setenforce 0

#Specific CentOS fixes

sed -i.save 's/enabled=0/enabled=1/' /etc/yum.repos.d/CentOS-PowerTools.repo

# Get latest Tomcat 9 version number

TOMCAT_VER=$(wget -qO- --no-check-certificate https://tomcat.apache.org/download-90.cgi | grep '<a href="#9.' | cut -f2 -d'>' | cut -f1 -d'<' | head -n 1)

if [ -z "${TOMCAT_VER}" ]; then

echo "Error: Failed to get tomcat version"; exit 1;

# Execute install_openjdk and install_tomcat

install_openjdk;

install_tomcat;

# Save passwords to auth.txt and also display to user

echo "Passwords saved in /root/auth.txt"

cat /root/auth.txt

As root, save the above script as tomcat9-centos8.sh and make it executable.

[root@demo ~]# chmod +x tomcat9-centos8.sh

1	[root@demo ~]# chmod +x tomcat9-centos8.sh

Run the script:

[root@demo ~]# ./tomcat9-centos8.sh

1	[root@demo ~]# ./tomcat9-centos8.sh

Upon completion, the GUI and Manager passwords will be displayed as below:

Passwords saved in /root/auth.txt
tomcat manager pass: HTMpZINCcm6dJ1-MsvMVEljubtO2uCLv
tomcat admin pass: E3m5yW6Bhpmx6ryHx5ddlaPyGfI0eNQ8

Passwords saved in /root/auth.txt

tomcat manager pass: HTMpZINCcm6dJ1-MsvMVEljubtO2uCLv

tomcat admin pass: E3m5yW6Bhpmx6ryHx5ddlaPyGfI0eNQ8

The random passwords will also be saved as auth.txt in the root directory.

[root@demo ~]# ls -l
total 24
-rw-------. 1 root root 5589 Jan 13 21:54 anaconda-ks.cfg
-rw-r--r--. 1 root root   85 Mar 16 22:18 auth.txt
-rw-------. 1 root root 5355 Jan 13 21:54 original-ks.cfg
-rwxr-xr-x. 1 root root 3583 Mar 16 22:17 tomcat9-centos8.sh
[root@demo ~]#

[root@demo ~]# ls -l

total 24

-rw-------. 1 root root 5589 Jan 13 21:54 anaconda-ks.cfg

-rw-r--r--. 1 root root 85 Mar 16 22:18 auth.txt

-rw-------. 1 root root 5355 Jan 13 21:54 original-ks.cfg

-rwxr-xr-x. 1 root root 3583 Mar 16 22:17 tomcat9-centos8.sh

[root@demo ~]#

You should now be able to access Tomcat at:

http://domain.com:8080 or http://IP:8080