https://issues.apache.org/bugzilla/show_bug.cgi?id=53583
Priority: P2
Bug ID: 53583
Assignee: dev@tomcat.apache.org
Summary: Tomcat 7.0.27 ignores 'use IPv4' JAVA_OPTS in
tomcat.conf, listens only @IPv6 localhost when
separate IPv4/IPv6 sockets are specified
Severity: major
Classification: Unclassified
OS: Linux
Reporter: k9...@operamail.com
Hardware: All
Status: NEW
Version: 7.0.27
Component: Catalina
Product: Tomcat 7
I've installed
rpm -qa | grep -i ^tomcat
tomcat-lib-7.0.27-7.1.noarch
tomcat-docs-webapp-7.0.27-7.1.noarch
tomcat-javadoc-7.0.27-7.1.noarch
tomcat-webapps-7.0.27-7.1.noarch
tomcat-admin-webapps-7.0.27-7.1.noarch
tomcat-servlet-3_0-api-7.0.27-7.1.noarch
tomcat-7.0.27-7.1.noarch
tomcat-el-2_2-api-7.0.27-7.1.noarch
tomcat-jsp-2_2-api-7.0.27-7.1.noarch
with
update-alternatives --config java
There are 2 choices for the alternative java (providing
/usr/bin/java).
Selection Path Priority
Status
------------------------------------------------------------
0 /usr/lib64/jvm/jre-1.7.0-openjdk/bin/java 17147
auto mode
* 1 /usr/lib64/jvm/jre-1.7.0-openjdk/bin/java 17147
manual mode
2 /usr/lib64/jvm/jre-1.7.0-sun/bin/java 1700
manual mode
on
uname -a
Linux svr 3.1.10-1.16-desktop #1 SMP PREEMPT Wed Jun 27
05:21:40 UTC 2012 (d016078) x86_64 x86_64 x86_64
GNU/Linux
This server is configured for dual-stack, with separate sockets
intenionally/necessarily
specified for IPv6:
grep bindv6only /etc/sysctl.conf
net.ipv6.bindv6only = 1
as defined at:
https://www.kernel.org/doc/man-pages/online/pages/man7/ipv6.7.html
IPV6_V6ONLY (since Linux 2.4.21 and 2.6)
If this flag is set to true (nonzero),
then the socket is restricted to
sending and receiving IPv6 packets only.
In this case, an IPv4 and an
IPv6 application can bind to a single port
at the same time.
If this flag is set to false (zero), then
the socket can be used to
send and receive packets to and from an
IPv6 address or an IPv4-mapped
IPv6 address.
The argument is a pointer to a boolean
value in an integer.
The default value for this flag is defined
by the contents of the file
/proc/sys/net/ipv6/bindv6only. The
default value for that file is 0
(false).
I need Tomcat to listen/respond on IPv4 localhost @ 127.0.0.1.
So, reading here -
http://tomcat.10.n6.nabble.com/Tomcat-uses-IPv6-td2164369.html#a2164371
- and elsewhere, I set
vi /etc/tomcat/tomcat.conf
...
JAVA_OPTS="Djava.net.preferIPv4Stack=true
-Djava.net.preferIPv4Addresses=true"
CATALINA_OPTS="Djava.net.preferIPv4Stack=true
-Djava.net.preferIPv4Addresses=true"
...
now, @ tomcat start,
ps ax | grep tomcat
6530 ? Sl 0:03 /etc/alternatives/jre/bin/java
-Djava.net.preferIPv4Stack=true
-Djava.net.preferIPv4Addresses=true
-Djava.net.preferIPv4Stack=true
-Djava.net.preferIPv4Addresses=true -classpath
:/usr/share/tomcat/bin/bootstrap.jar:/usr/share/tomcat/bin/tomcat-juli.jar:/usr/share/java/commons-daemon.jar
-Dcatalina.base=/usr/share/tomcat
-Dcatalina.home=/usr/share/tomcat -Djava.endorsed.dirs=
-Djava.io.tmpdir=/var/cache/tomcat/temp
-Djava.util.logging.config.file=/usr/share/tomcat/conf/logging.properties
-Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
org.apache.catalina.startup.Bootstrap start
but, Tomcat still listens only on IPv6 @ port 8080,
sudo netstat -tlpn | grep java
tcp 0 0 :::8080 :::*
LISTEN 13005/java
tcp 0 0 127.0.0.1:8795 :::*
LISTEN 9388/java
tcp 0 0 127.0.0.1:8005 :::*
LISTEN 13005/java
tcp 0 0 :::8009 :::*
LISTEN 13005/java
and is unavailable/unreachable @ 127.0.0.1
telnet 127.0.0.1 8080
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
telnet ::1 8080
Trying ::1...
Connected to ::1.
Escape character is '^]'.
telnet>
reading here on this issue:
http://linux.derkeiler.com/Mailing-Lists/Debian/2009-12/msg01262.html
" ... Thus you should report a bug against Tomcat. Also you can replace
"net.ipv6.bindv6only=1" with "net.ipv6.bindv6only=0" in your /etc/sysctl.d/ as
a temporary solution. ..."
which, as per above, is not a viable/acceptable workaround.
Fwiw, in this config, any/all other apps on the box (nginx, varnish, apache,
bind, dhcp(6), firewall, etc) are easily configured to listen on IPv4 &/or IPv6
(non)localhost addresses.
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