Does your terminal make funny characters when you press the arrow keys instead of retrieving the last command?
You can fix that a couple quick installs.
pip install ipython
# may require you to 'yum install ncurses ncurses-devel' or similar, depending on your os
pip install readline
Now access the shell substituting the command 'python' with 'ipython'. It should behave nicer.
IPython can do a lot more for you than give you a pretty shell. Check out its capabilities at the project website.
Saturday, May 31, 2014
Installing mongodb on an old computer
I have a little old 32 bit Compaq machine that I'm setting up a playground server for projects. It has a lot of disk space (~500 GBs), a decent CPU (AMD Sempron 2 GHz), and a nice amount of ram (~2 Gb). But it's old. And it's 32 bit. Still, I wanted to get mongo running on it.
When I tried to install mongo using the instructions for mongodb (yes, I made the change for the 32 bit version), I ran into the following error:
[tcvh@localhost ~]$ sudo service mongod start
Starting mongod: bash: line 1: 22495 Illegal instruction /usr/bin/mongod -f /etc/mongod.conf > /dev/null 2>&1
[FAILED]
I looked into this a little, and it seemed the easiest solution was to roll back the version. At first I tried just following their instructions for specifying a different version number, but when I went to install, yum couldn't find anything.
So instead I crawled around the directory listing for the RPM and saw that they recently changed the naming convention of the RPMs. I tried a few different things, but eventually found that for installing version 2.0.4, the following works.
The contents of "/etc/yum.repos.d/mongodb.repo":
[mongo-10gen]
name=MongoDB Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/i686/
gpgcheck=0
enabled=1
The installation commands:
sudo yum install mongo-10gen-2.0.4
sudo yum install mongo-10gen-server-2.0.4
After that you can see that mongod is installed in "/usr/bin"
updatedb # you just added stuff, so update the search index
locate mongo # hey, look at that, it's there
You can start up the server and get into the shell with the following:
sudo service mongod start # kick off the server
mongo # get into the shell
You may also want to set up the service to run when the machine boots:
sudo chkconfig mongod on
That's it.
When I tried to install mongo using the instructions for mongodb (yes, I made the change for the 32 bit version), I ran into the following error:
[tcvh@localhost ~]$ sudo service mongod start
Starting mongod: bash: line 1: 22495 Illegal instruction /usr/bin/mongod -f /etc/mongod.conf > /dev/null 2>&1
[FAILED]
I looked into this a little, and it seemed the easiest solution was to roll back the version. At first I tried just following their instructions for specifying a different version number, but when I went to install, yum couldn't find anything.
So instead I crawled around the directory listing for the RPM and saw that they recently changed the naming convention of the RPMs. I tried a few different things, but eventually found that for installing version 2.0.4, the following works.
The contents of "/etc/yum.repos.d/mongodb.repo":
[mongo-10gen]
name=MongoDB Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/i686/
gpgcheck=0
enabled=1
The installation commands:
sudo yum install mongo-10gen-2.0.4
sudo yum install mongo-10gen-server-2.0.4
After that you can see that mongod is installed in "/usr/bin"
updatedb # you just added stuff, so update the search index
locate mongo # hey, look at that, it's there
You can start up the server and get into the shell with the following:
sudo service mongod start # kick off the server
mongo # get into the shell
You may also want to set up the service to run when the machine boots:
sudo chkconfig mongod on
That's it.
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