# How To Run Multiple Memcached Processes In CentOS 7

**URL:** <https://onehack.st/t/how-to-run-multiple-memcached-processes-in-centos-7/54329>\
**Category:** Tutorials & Methods\
**Tags:** tips-tricks\
**Created:** [August 20, 2019, 6:42pm UTC](https://onehack.st/t/how-to-run-multiple-memcached-processes-in-centos-7/54329 "2019-08-20T18:42:12Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Aina](https://onehack.st/user_avatar/onehack.st/aina/32/167469_2.png) [@Aina](https://onehack.st/u/Aina)\
**Post date:** [August 20, 2019, 6:42pm UTC](https://onehack.st/t/how-to-run-multiple-memcached-processes-in-centos-7/54329/1 "2019-08-20T18:42:12Z")

</div>

**Install memcached from YUM repository**

Use following YUM command to install memcached package from CentOS 7 base repository:

Code:

```auto
yum -y install memcached

```

This installation provides a memcached instance with configuration file /etc/sysconfig/memcached.

**Run multiple memcached processes**

Assume that you have a requirement of running two memcached processes with following configurations:

config1 – configuration of first process

listen address: 127.0.0.1  
listen port: 11211  
maximum concurrent connections: 1024  
maximum in-memory cache size: 256MB

config2 – configuration of second process

listen address: 127.0.0.1  
listen port: 11212  
maximum concurrent connections: 2048  
maximum in-memory cache size: 512MB

Let us use config1 configuration for the default memcached process.  
For that, edit /etc/sysconfig/memcached using your favorite editor (say nano text editor) and make following settings in it:

Code:

```auto
nano /etc/sysconfig/memcached
PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="256"
OPTIONS="-l 127.0.0.1"

```

Start the first memcached process:

Code:

```auto
systemctl start memcached.service

```

Enable it on server boot:

Code:

```auto
systemctl enable memcached.service

```

Check status of first memcached process; it should be running if no problem happened:

Code:

```auto
systemctl status memcached.service
memcached.service - Memcached
   Loaded: loaded (/usr/lib/systemd/system/memcached.service; enabled)
   Active: active (running) since Mon 2014-12-15 15:20:00 EDT; 17s ago
 Main PID: 24217 (memcached)
   CGroup: /system.slice/memcached.service
           └─24217 /usr/bin/memcached -u memcached -p 11211 -m 64 -c 1024 -l 127.0.0.1
Dec 15 15:20:00 localhost.localdomain systemd[1]: Starting Memcached...
Dec 15 15:20:00 localhost.localdomain systemd[1]: Started Memcached.

```

To create the second process with config2 configuration, create its configuration file /etc/sysconfig/memcached2 with following settings:

Code:

```auto
nano /etc/sysconfig/memcached2
PORT="11212"
USER="memcached"
MAXCONN="2048"
CACHESIZE="512"
OPTIONS="-l 127.0.0.1"
Create systemd unit file /etc/systemd/system/memcached2.service with following settings:

[Unit]
Description=Memcached2
Before=httpd.service
After=network.target

[Service]
Type=simple
EnvironmentFile=-/etc/sysconfig/memcached2
ExecStart=/usr/bin/memcached -u $USER -p $PORT -m $CACHESIZE -c $MAXCONN $OPTIONS

[Install]
WantedBy=multi-user.target

```

Start the second memcached process:

Code:

```auto
systemctl start memcached2.service

```

Enable it on server boot:

Code:

```auto
systemctl enable memcached2.service

```

Check status of second memcached process; it should be running if no problem happened:

Code:

```auto
systemctl status memcached2
memcached2.service - Memcached2
   Loaded: loaded (/etc/systemd/system/memcached2.service; enabled)
   Active: active (running) since Mon 2014-12-15 15:20:03 EDT; 20s ago
 Main PID: 24226 (memcached)
   CGroup: /system.slice/memcached2.service
           └─24226 /usr/bin/memcached -u memcached -p 11212 -m 128 -c 1024 -l 127.0.0.1

Dec 15 15:20:03 localhost.localdomain systemd[1]: Starting Memcached2...
Dec 15 15:20:03 localhost.localdomain systemd[1]: Started Memcached2.

```

To verify listening sockets of memcached processes, use following ss command:

ss -lnp | grep memcached

Code:

```auto
tcp UNCONN 0 0 127.0.0.1:11211 *:* users:(("memcached",24217,27))
tcp UNCONN 0 0 127.0.0.1:11212 *:* users:(("memcached",24226,27))
tcp LISTEN 0 128 127.0.0.1:11211 *:* users:(("memcached",24217,26))
tcp LISTEN 0 128 127.0.0.1:11212 *:* users:(("memcached",24226,26))

```

You can see that the two memcached processes are listening to ports 11211 and 11212 respectively on loopback IP address 127.0.0.1.

If you require more memcached processes, create separate configuration and systemd unit files. Then manage the processes using systemctl as explained above.

**Conclusion**

In this article, we showed you a method to run multiple memcached processes on a CentOS 7 Linux system by extending the default binary RPM installation. Each extra memcached process owns a separate configuration file and is managed by a separate systemd service unit file.