Automated DB2 installation on CentOS 7

db2_install.sh

#!/bin/sh

WHOAMI=$(whoami)
if [ "$WHOAMI" != "root" ]; then
    echo must run as root
    exit -1
fi

HOSTNAME=$(hostname)
WC=$(grep $HOSTNAME /etc/hosts | wc -l)
if [ "$WC" == "0" ]; then
    echo hostname missing from /etc/hosts
    exit -1
fi

DB2_SOURCE=v10.5_linuxx64_expc.tar.gz
DB2_HOME=/home/db2inst1/sqllib
DB2_DATA=/home/db2inst1/data

groupadd db2iadm1
useradd -G db2iadm1 db2inst1

usermod -a -G db2inst1 craig

yum install -y \
    vi \
    sudo \
    passwd \
    pam \
    pam.i686 \
    ncurses-libs.i686 \
    file \
    libaio \
    libstdc++-devel.i686 \
    nscd

yum clean all

systemctl start nscd
systemctl enable nscd

mv $DB2_SOURCE /tmp
cd /tmp
tar xf $DB2_SOURCE

su - db2inst1 -c "/tmp/expc/db2_install -b /home/db2inst1/sqllib"
echo '. /home/db2inst1/sqllib/db2profile' >> /home/db2inst1/.bash_profile

sed -ri 's/(ENABLE_OS_AUTHENTICATION=).*/\1YES/g' $DB2_HOME/instance/db2rfe.cfg
sed -ri 's/(RESERVE_REMOTE_CONNECTION=).*/\1YES/g' $DB2_HOME/instance/db2rfe.cfg
sed -ri 's/^\*(SVCENAME=db2c_db2inst1)/\1/g' $DB2_HOME/instance/db2rfe.cfg
sed -ri 's/^\*(SVCEPORT)=48000/\1=50000/g' $DB2_HOME/instance/db2rfe.cfg

mkdir $DB2_DATA
chown db2inst1.db2iadm1 $DB2_DATA

su - db2inst1 -c "db2start && db2 UPDATE DBM CFG USING DFTDBPATH $DB2_HOME IMMEDIATE && db2set DB2COMM=TCPIP"
su - db2inst1 -c "db2stop force"

su - db2inst1 -c "db2iauto -on db2inst1"

mkdir -p /var/db2
$DB2_HOME/bin/db2fmcu -u -p $DB2_HOME/bin/db2fmcd
su - db2inst1 -c "$DB2_HOME/bin/db2fm -i db2inst1 -U"
su - db2inst1 -c "$DB2_HOME/bin/db2fm -i db2inst1 -u"
su - db2inst1 -c "$DB2_HOME/bin/db2fm -i db2inst1 -f on"

$DB2_HOME/bin/db2fmcu -d
cat > /etc/systemd/system/db2fmcd.service << EOF

[Unit]
Description=DB2V105

[Service]
ExecStart=/home/db2inst1/sqllib/bin/db2fmcd
Restart=always

[Install]
WantedBy=default.target
EOF

systemctl daemon-reload
systemctl start db2fmcd
systemctl enable db2fmcd

cd /home/db2inst1/sqllib/instance
./db2rfe -f ./db2rfe.cfg
rm -rf /tmp/db2*
rm -rf /tmp/expc*
rm -f /tmp/$DB2_SOURCE

read -p "Reboot required, press any key to continue... " -n1 -s

reboot

Are you sure about the value of DFTDBPATH?

For me, it should be set to the home directory of db2inst1 not $HOME/sqllib
DB2_HOME is correct on the point of view of DB2 but I guess not for DFTDBPATH

DFTDBPATH=/home/db2inst1
db2 UPDATE DBM CFG USING DFTDBPATH $DFTDBPATH IMMEDIATE

su - db2inst1
db2 GET DBM CFG | grep -i DFTDBPATH
Default database path (DFTDBPATH) = /home/db2inst1

env | grep DB2_HOME
DB2_HOME=/home/db2inst1/sqllib

env | grep IBM_DB_HOME
IBM_DB_HOME=/home/db2inst1/sqllib

https://www.ibm.com/support/knowledgecenter/SSEPGG_10.5.0/com.ibm.db2.luw.admin.config.doc/doc/r0000281.html
http://www-01.ibm.com/support/docview.wss?uid=swg1IC63555