I downloaded Apache Kafka and successfully completed the quickstart . When i tried running the example program provided, I got an error :
cannot load main class.
I dont know what I'm missing I even set the classpath.
Run this command if you are on Amazon EC2:
sudo yum install java-1.6.0-openjdk-devel
javac must be there. For that you need both JDK and JRE. You probably only have JRE installed.
Related
I searched this forum already, no working answer is found for my case:
I installed java 1.8
I downloaded the binary version of zookeeper-3.5.5 from https://www.apache.org/dist/zookeeper/zookeeper-3.5.5/apache-zookeeper-3.5.5-bin.tar.gz
I changed the zoo_sample.cfg to zoo.cfg, no changes made to the cfg
I tried to start zookeeper as root:
[root#pocdnr1n1 apache-zookeeper-3.5.5-bin]# bin/zkServer.sh start conf/zoo.cfg
I received error in log:
Could not find the main class: org.apache.zookeeper.server.quorum.QuorumPeerMain. Program will exit.
Thanks.
I think I have found the root cause, posting it here for future readers:
The culprit is Java.
I had an old java version on the node, this can be verified by running java -version
In my case the java was 1.6, what I did is to reset the environment to add the new java 1.8 to it:
# export JAVA_HOME=/opt/jdk1.8.0_151
# export JRE_HOME=/opt/jdk1.8.0_151/jre/
# export PATH=$PATH:/opt/jdk1.8.0_151/bin:/opt/jdk1.8.0_151/jre/bin
You should add the PATH to the .bash_profile so that it becomes permanent.
Now after that you run source .bash_profile, now you have set java 1.8 as the default java. again, you can confirm that by running java -version
Run your zookeeper again and it will be started as expected.
The common missings here are:
downloaded the non-binary zookeeper
java is too low (1.6 doesn't work, 1.8 is recommended)
environment should be set to ensure java 1.8 is picked up as default version
I hope this helps.
If you look at ZooKeeper Administrator's Guide - Required Software for 3.5.5 it says:
ZooKeeper runs in Java, release 1.7 or greater (JDK 7 or greater, FreeBSD support requires openjdk7).
which affirms what you found out. Your Java version was too low.
What worked for me was rebuilding with ./gradlew jar -PscalaVersion-2.13.10
I was using kafka straight from source from github.com/apache/kafka and that step was given to me when I cloned a fresh copy of the repo to start from scratch.
I had done a git pull on my old version, so it broke the dependencies, which I forgot I must have at one point installed.
I install Cygnus from RPM repository like this and now i dont know how continue.
I try continue whit this section and i got the following error:
bash: APACHE_FLUME_HOME/bin/cygnus-flume-ng: No such file or directory
I am really confused about documentation, because i restart 3 times at start when i try to use docker image, the image got so much errors.
You need java, maven and Flume correctly installed before starting.
export APACHE_FLUME_HOME_BIN=/usr/local/flume to your shell
I recommend following the install from source, which guide you through all the steps.
For docker start with the cygnus-common Dockerfile which uses centos6 as base.
I'm new to collectd and Riemann. Im essentially trying to direct collectd logs to a riemann server instance. I understand that I need write_riemann plugin installed. I tried compiling the source files for write_riemann available online, but it includes a file called "riemann.pb-c.h", which is no where to be found. Please help!
Download the binary. After running the build script, while running the configure script include "--enable-write_riemann", this should install it. I had a lot of dependencies missing on CentOS, which threw a lot of errors. Once they were installed, write_riemann plugin was compiled and installed. Another issue you might face while installing the dependency is not able to find the right packages for protobuf-c.I was using yum package installer. Go to sudo vi /etc/yum.repos.d/epel.repo and change enabled from 0 to 1. After this, the protobuf-c processor was recognised while running the configure script. This solved my issue. Hope it does yours too!
I am getting the following error:
PHP Warning: PHP Startup: Unable to load dynamic library
'/usr/lib/php/extensions/no-debug-non-zts-20121212/mcrypt.so' -
/lib64/libc.so.6: version `GLIBC_2.14' not found (required by
/usr/lib/php/extensions/no-debug-non-zts-20121212/mcrypt.so)
Does mcrypt require glibc 2.14?
We are running CentOS 6.4 (latest stable version of CentOS) and it comes with glibc 2.12 (can't really upgrade glibc as being a core part of OS, changing it will likely break lots of stuff)
How do I make my PHP 5.5.4 run mcsypt under these circumstances?
Current configuration (phpinfo output) is here.
I was also having issues installing mcrypt on my VPS dev server so I thought I would post my solution in the hopes that it helps someone. I am running Centos OS 6.5 and had upgraded PHP to 5.5.13 using the Webtatic EL yum repository. https://webtatic.com/packages/php55/
First shh into your server
ssh admin#domain.com
initially I was trying to do (which was not working):
yum update
yum install php-mcrypt
I then realized my mistake when I looked at php -v and realized php-common was conflicting as the above code was trying to load a dependency from 5.3.
I then executed the following correct commands:
rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm
yum update
yum install php55w-mcrypt
service httpd restart
This worked perfectly for me.
I also read while researching this issue that some people did have to add the extension to their .ini file manually by adding the following line but i did not have to do this.
extension=mcrypt.so
you can find the location of your php.ini file by looking at phpinfo(); and see which configuration it is loading. For me the following ini files were loading:
/etc/php.ini
/etc/php.d/mcrypt.ini
/var/www/vhosts/system/domain.com/etc/php.ini
If the installation is successful then you will see the extension when you echo phpinfo();
Try installing php-mcrypt using yum. That should pull in any other libraries you need to run it.
yum install php-mcrypt
In light of your update, it would appear that you are trying to use the MCrypt extension built from another PHP Source which was created by an updated GLIBC library. The only proper solution I can see is the following:
You first need to ensure you have libmcrypt, libmcrypt-devel, and mcrypt installed before continuing. Check your CentOS repository.
Download the PHP Source from http://php.net
Untar the downloaded source tar -zxf php-5.5.4.tar.gz
cd into the source cd php-5.4.4
Copy your current ./configure string. The whole thing!
Add support for Mcrypt --with-mcrypt=/usr and run the new configure command
make && make install
restart Apache and PHP-FPM
This will keep your current configuration just as CentOS has built it but with the additional support of MCrypt as you are looking to have. Once you've done this, you do not need to enable the MCrypt extension in your php.ini file as it will be built into PHP itself and will be automatically loaded for you now.
When in doubt, you can also read up on the installation here http://us1.php.net/manual/en/mcrypt.installation.php
I am getting a bunch of compile errors when I try to install the MySQL DBD::mysql Perl library. I am trying to install this library on OpenSuse linux (SUSE Linux Enterprise server 10 (x86_64) version 10, patch level 4)
The install fails when trying to compile dbdimp.h. There are hundreds of complile errors but I have reason to believe they all stem from the first 3:
dbdimp.h:23:49: error: mysql.h: No such file or directory
dbdimp.h:24:45: error: mysqld_error.h: No such file or directory
dbdimp.h:26:49: error: errmsg.h: No such file or directory
I believe that the reason I am getting the errors above is that I have no MySql Client installed. I do not know how to install mysql client (I believe I am supposed to get some version of libmysqlclient).
I am brand new to opensuse and vaguely familar with installing packages on Linux in general have used yum, yast, apt-get on ubuntu + centOS previously but the only package manager tools that seem to be on OpenSuse 10 are rpm and zypper. I have not managed to install the required mysql client using either of these. If anyone knows how to install MySql Client to resolve my issue I would greatly appreciate any recomendations
Thanks
You need to install MySQL or the MySQL client libraries, either through your system's package manager or by following the installation instructions from the source code.
It sounds like your question is really "How do I install MySQL on OpenSuse", which would be more appropriate for one of the other StackExchange sites.
I was able to resolve this to a point. In my original question, I stated that I had tried using YAST but that it had not worked. In fact, I did not fully explore the YAST install option but when I did, I managed to download install the required librarys by following an article I found (http://adminramble.com/install-mysql-yast/#chitika_close_button)
I was able to open the YAST GUI in the terminal window (not an X-window display) and navigate through the "software management" section wherein I was able to do a search for MySql. Amoung the search results were mysql client libraries, which I then selected and hit "Accept". The installation started and completed successully.
In order to complile the PERL DBD::mysql module, I had to create a new makefile with the ccflags specified so that the header files could be found:
perl Makefile.PL --cflags -I/usr/include/mysql
I say "to a point" at the top of this comment because I then ran into further problems compiling but my original issue posted has been partially resolved and getting this far may help someone else who is experiencing the same problem. Will update if I get a solution to the compile problem.