Building ELK on CentOS 7

[JaredBusch]

I have D&D tonight, but will be on this tomorrow.

[scottalanmiller]

@JaredBusch said:

I have D&D tonight, but will be on this tomorrow.

Awesome. Let me know if you run into any problems. I tried hard to make this as scriptable as possible. I "think" that you can pop this all into a script and just run it, but there are so many moving parts that I'm wary to present it that way. This was stepped through on a vanilla build. One of the lines is just to verify configuration of the Logstash files and doesn't actually do anything. I also tried to compress the package installs into two lines at the beginning as much as possible.

SELinux is addressed in there, no need to disable SELinux or any crap like that This actually configures that properly (I hope.)

[stacksofplates]

@scottalanmiller said:

@JaredBusch said:

I have D&D tonight, but will be on this tomorrow.

Awesome. Let me know if you run into any problems. I tried hard to make this as scriptable as possible. I "think" that you can pop this all into a script and just run it, but there are so many moving parts that I'm wary to present it that way. This was stepped through on a vanilla build. One of the lines is just to verify configuration of the Logstash files and doesn't actually do anything. I also tried to compress the package installs into two lines at the beginning as much as possible.

SELinux is addressed in there, no need to disable SELinux or any crap like that This actually configures that properly (I hope.)

This is definitely one of the more time consuming installs I've done. I need to work on an Ansible playbook for it. I install it so infrequently that it might not be worth it.

[MattSpeller]

Eesh, I'm in over my head with this one. Might give it a crack at home but my goodness...

[RamblingBiped]

Nice! I'll try to give this a whirl at some point in the next couple of days.

Thanks!

[Dashrender]

@scottalanmiller said:

Half a terabyte is a good starting point for disk space.

So much for me trying it - I might be lucky if I have 100 GB available for this.

[scottalanmiller]

@Dashrender said:

@scottalanmiller said:

Half a terabyte is a good starting point for disk space.

So much for me trying it - I might be lucky if I have 100 GB available for this.

You can do that for seeing what it looks like. 20GB will work for a very tiny test workload. But very tiny.

[scottalanmiller]

Just tested on a fresh build and it works BEAUTIFULLY. I put it into a script and ran it instead of going line by line, worked on the first try, no problems. It stops in the middle and asks for a password, that could be moved to the end or something, but it works just fine and isn't so slow that you'd want to walk away. So I added a BASH script header. If you want, just copy/paste into a text file and run it. Boom, done. Working ELK in a minute.

[JaredBusch]

@scottalanmiller so what do you setup your disk partitioning like in CentOS 7?

On a minimal install left to automatic, if you use a larger drive, it will create a separate partition for all the space after 50gb.

this is highly annoying because I created a 127GB drive (default in Hyper-V) and now 50GB is separate from all the rest.

[JaredBusch]

like this

[root@elk ~]# df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/centos_elk-root   50G  855M   50G   2% /
devtmpfs                     906M     0  906M   0% /dev
tmpfs                        916M     0  916M   0% /dev/shm
tmpfs                        916M  8.3M  907M   1% /run
tmpfs                        916M     0  916M   0% /sys/fs/cgroup
/dev/sda2                    494M   98M  396M  20% /boot
/dev/sda1                    200M  9.5M  191M   5% /boot/efi
/dev/mapper/centos_elk-home   75G   33M   75G   1% /home
tmpfs                        184M     0  184M   0% /run/user/0
[root@elk ~]#

[JaredBusch]

You should at least tell the user that you are asking for the kibana password.

htpasswd -c /etc/nginx/htpasswd.users kibanauser

[JaredBusch]

I had this error.

[JaredBusch]

Looks like maybe you forgot to start firewalld?

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   814  100   814    0     0   1370      0 --:--:-- --:--:-- --:--:--  1372
{
  "acknowledged" : true
}
FirewallD is not running
FirewallD is not running
[root@elk ~]# yum install firewalld
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirror.oss.ou.edu
 * epel: fedora-epel.mirror.lstn.net
 * extras: centos.mirrors.wvstateu.edu
 * updates: centos.mirrors.wvstateu.edu
Package firewalld-0.3.9-14.el7.noarch already installed and latest version
Nothing to do
[root@elk ~]# systemctl start firewalld
[root@elk ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2016-02-23 23:55:11 CST; 14s ago
 Main PID: 11482 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─11482 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid

Feb 23 23:55:09 elk systemd[1]: Starting firewalld - dynamic firewall daemon...
Feb 23 23:55:11 elk systemd[1]: Started firewalld - dynamic firewall daemon.
[root@elk ~]#

[JaredBusch]

Yeah, you set it to install, but you never start or enable it.

[JaredBusch]

Line 109 needs commented out.

add this right after the yum install to fix the firewall.

yum -y install wget firewalld epel-release
systemctl enable firewalld
systemctl start firewalld
yum -y install nginx httpd-tools unzip

I would just remove line 109 it serves no purpose.

Edit: Some dumbass forgot to snapshot the image so he could repeat the install...

[JaredBusch]

Why lock out with .htaccess? There is no hint what is needed to log in here.

I hate this level of authentication.

Using kibanauser and the password I chose, results in Kibana setup.

[scottalanmiller]

@JaredBusch said:

@scottalanmiller so what do you setup your disk partitioning like in CentOS 7?

If I'm doing this for product, I do 20GB for the OS and 200GB+ on a second VHD for the data. I put it all under LVM and make a XFS filesystem on the secondary mount and mount it to data and make a symlink for the Elasticsearch database directory into there.

[scottalanmiller]

@JaredBusch said:

Why lock out with .htaccess? There is no hint what is needed to log in here.

It's how Digital Ocean does it as well. Kibana doesn't have a built in authentication scheme that I know of. HTAccess is very simple for someone to just get started.

[scottalanmiller]

And simple to remove when you want to move to something else.

[scottalanmiller]

@JaredBusch said:

Line 109 needs commented out.

add this right after the yum install to fix the firewall.

yum -y install wget firewalld epel-release
systemctl enable firewalld
systemctl start firewalld
yum -y install nginx httpd-tools unzip

I would just remove line 109 it serves no purpose.

Edit: Some dumbass forgot to snapshot the image so he could repeat the install...

Thanks. That was formatting I had originally put in before scripting it.