Tag: linux

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Checking iptables filtering for bridge networking on Ubuntu (for Kubernetes setup)

If you’re installing and configuring a Kubernetes cluster on bare metal or in a VM yourself, one of the install steps using kubeadm says to check iptables filtering for bridge networking, but it doesn’t exactly say how to do this per distro.

The setting required is:

net.bridge.bridge-nf-call-iptables=1

There are specific steps in the kubadm docs above for RHEL/CentOS to add this setting. For Ubuntu it seems this is set by default, but you can confirm by:

sysctl net.bridge.bridge-nf-call-iptables

and the expected setting is 1:

net.bridge.bridge-nf-call-iptables = 1

It seems on Ubuntu 16.04 server this is set to 1 by default, but if it’s 0, you can edit this property in /etc/sysctl.conf

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Building Redis from source on Ubuntu server 18.04

After downloading redis source and attempting to make on Ubuntu server 28.04, it looks like I’ve got some dependencies missing:

kev@ubuntu18-redis1:~/redis/redis-4.0.11$ make

cd src && make all

make[1]: Entering directory '/home/kev/redis/redis-4.0.11/src'

    CC Makefile.dep

    CC adlist.o

In file included from adlist.c:34:0:

zmalloc.h:50:10: fatal error: jemalloc/jemalloc.h: No such file or directory

 #include <jemalloc/jemalloc.h>

          ^~~~~~~~~~~~~~~~~~~~~

compilation terminated.

I found an identical post about this issue, with not building the dependencies. To fix:

cd deps
make hiredis jemalloc linenoise lua geohash-int
cd ..
make
sudo make install

That resulted in a clean install, ready to start redis-server !

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Installing RabbitMQ rpm on RHEL 5.11

Rough notes for installing RabbitMQ on RHEL5.11.

Install the EPEL repo (not sure if this is needed for the RPM install or not):

curl -O http://archives.fedoraproject.org/pub/archive/epel/5/x86_64/epel-release-5-4.noarch.rpm
rpm -ivh epel-release-5-4.noarch.rpm 
yum update

Install the erlang dependency (from answer here):

wget -O /etc/yum.repos.d/epel-erlang.repo http://repos.fedorapeople.org/repos/peter/erlang/epel-erlang.repo
yum install erlang

Download the noarch version of RabbitMQ:

wget -O http://www.rabbitmq.com/releases/rabbitmq-server/v3.1.1/rabbitmq-server-3.1.1-1.noarch.rpm

Note on my initial install of RHEL 5.11 I could’t wget or curl to any https based sites, as I’d get SSL connection/certificate errors. I downloaded the rpm on another machine and scp’d it up to my server.

Install the rpm:

rpm -i rabbitmq-server-3.1.1-1.noarch.rpm

Enable the admin console:

rabbitmq-plugins enable rabbitmq_management

Delete the default guest user:

rabbitmqctl delete_user guest

Create a new admin user and add to the admin group:

rabbitmqctl add_user newuserid password
rabbitmqctl set_user_tags admin administrator

Start/stop/restart the server:

/sbin/service rabbitmq-server start
/sbin/service rabbitmq-server stop
/sbin/service rabbitmq-server restart

Additional notes:

I tried the generic Linux version wouldn’t start up for me, it gave this error, so found a working RPM above instead:

{"init terminating in do_boot",{undef,[{rabbit_prelaunch,start,[]},{init,start_it,1},{init,start_em,1}]}}

init terminating in do_boot ()
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