The Tool Desk
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This guide covers Debian and Ubuntu, Red Hat and Fedora, source builds, localhost and private-network designs, Unix sockets, SASL authentication, firewall rules, verification, sizing, and recovery when the service does not behave as expected.
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What Memcached does—and what installation does not do
Memcached is an in-memory application cache. It stores short-lived key/value entries so an application can avoid repeating expensive database queries, API calls, or page assembly. Installing the daemon alone does not accelerate a website or game service. The application must be programmed with a Memcached client, choose which objects to cache, set expiration and invalidation behavior, and handle a cache miss by obtaining the data from its source.
Memcached is not a database, durable queue, or general-purpose data store. Entries can disappear when memory is reclaimed or the service restarts, so applications must always be able to regenerate cached data. Treat the cache as disposable and keep authoritative data elsewhere.
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The daemon listens for client traffic, normally on TCP port 11211. Older deployments may also have UDP enabled. Memcached’s default has been TCP-only since version 1.5.6, but setting -U 0 explicitly makes the intended security posture visible in configuration reviews.
Choose the deployment model before installing
| Decision | Recommended choice | When another choice is justified | Security and maintenance effect |
|---|---|---|---|
| Package or source | Distribution package | Build from source only when the package is too old or lacks a required feature | Packages receive distribution updates and normally include a service unit; source builds require you to own upgrades, service integration, and file locations |
| Listen address | 127.0.0.1 for an application on the same VPS |
The VPS’s private address when trusted application nodes connect over an isolated network | Localhost prevents network reachability; a private bind requires matching host and cloud firewall rules |
| Transport | TCP with UDP disabled (-U 0) |
UDP only for a specifically designed, controlled legacy arrangement | Disabling UDP removes an additional protocol surface and makes audits simpler |
| Local-only transport | Unix socket with -s |
TCP when clients run on other machines or cannot use Unix sockets | A socket can eliminate TCP and UDP listeners, but every client must support the socket and its permissions |
| Client access control | Network isolation plus firewalling | SASL in addition to isolation when supported by both server and clients | SASL authenticates clients but does not encrypt their traffic |
Do not bind Memcached to a public interface simply because a client is inconvenient to configure. The Memcached configuring guide warns that the daemon is not designed to defend itself from arbitrary Internet connections. Public exposure can allow untrusted users to read, overwrite, or flush cache data and can make the service part of an abuse incident.
Install the distribution package
Debian or Ubuntu
- Refresh package metadata:
sudo apt update - Install the daemon:
sudo apt-get install memcached - Enable it at boot and start it now:
sudo systemctl enable --now memcached
Package configuration is commonly stored in /etc/memcached.conf, although the exact path and service-unit details depend on the VPS image. Read the installed unit and configuration rather than assuming a distribution default.
Red Hat, Fedora, and related systems
- Install the package with the current package manager:
sudo dnf install memcached
On older releases, use:sudo yum install memcached - Enable and start the service:
sudo systemctl enable --now memcached
Red Hat-family releases can place options in a distribution-specific environment file or service configuration. Locate the active unit with systemctl cat memcached and identify the file referenced by its ExecStart line before changing options.
Confirm the package actually started
Run:
systemctl status memcachedA successful start shows an active service. If it is inactive or failed, inspect recent messages before editing anything:
journalctl -u memcached -b --no-pagerDo not proceed to firewall testing until the daemon is running with the intended options.
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Build from source only when the package is unsuitable
A source build is appropriate when a distribution package is missing a required feature or is materially older than the release you need. It shifts responsibility for patching, upgrades, service integration, and rollback to you. The Memcached downloads page listed version 1.6.45, released 2026-07-09, as the latest stable release at the time covered here; verify the release you select on the project’s downloads page before building.
- Install a compiler toolchain and the libevent development package using your distribution’s package manager. The package names differ between Debian-family and Red Hat-family systems.
- Download the chosen release tarball from the Memcached project, verify its provenance according to your organization’s process, and unpack it.
- Enter the extracted directory and configure it:
./configure - Compile it:
make - Run the project’s tests before installation:
make test - Install the compiled files:
sudo make install
A source install does not automatically create the same user, directories, service unit, log integration, or default configuration that a distribution package provides. Create a dedicated unprivileged service account, write an explicit systemd unit, and document the install prefix and upgrade procedure before placing the build into production. Never replace a package-managed binary in place without recording how to restore the previous version.
Set a safe listening address and disable UDP
Open the active Memcached configuration file—commonly /etc/memcached.conf on Debian and Ubuntu—and set options equivalent to the following for an application running on the same VPS:
-l 127.0.0.1
-U 0Localhost binding
-l 127.0.0.1 accepts connections only through the IPv4 loopback interface. This is the right starting point when the web server, game backend, worker, or API using the cache runs on the same machine. Debian and Ubuntu often ship with localhost already selected, but inspect the actual file and the service command line; a cloud image or an administrator may have changed it.
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Private-interface binding
For trusted clients on other nodes, replace the loopback address with the VPS’s private address, such as 10.0.0.11. Bind only to the interface used by that private network, not to a wildcard address. Record every client subnet that needs access; that list becomes the basis for both firewall layers and later audits.
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Private addressing is not authentication by itself. A compromised host inside the private network may still be able to issue Memcached commands, so combine network restriction with SASL where supported and keep the private segment appropriately controlled.
Unix-socket mode for a strictly local service
If every client is local and supports Unix sockets, configure:
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-s /path/to/socketSet a socket permission mask that lets the application user connect without granting access to unrelated users. Enabling a Unix socket disables TCP and UDP listeners, removing network exposure altogether. The socket path and permissions must remain available after reboot, and service ordering must ensure the directory exists before Memcached starts.
Explicitly disable UDP
Use -U 0 unless you have a documented, controlled reason to operate UDP. Check the effective service options after every package or configuration change; a setting in a systemd environment file can override what you expected from the main configuration file.
Protect port 11211 with both firewall layers
Network isolation should be enforced twice: on the VPS itself and in the provider’s cloud security group, security list, or equivalent network policy.
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11211. Loopback traffic should remain local. - For private-interface deployments, allow TCP
11211only from the exact application hosts or private subnet. Do not create a rule for0.0.0.0/0or an unrestricted IPv6 range. - Do not allow UDP
11211unless the design explicitly requires it; with-U 0, there should be no reason to create such a rule. - Keep administrative SSH access and cache access as separate rules so a later SSH change cannot accidentally widen the cache.
On a host using UFW, a narrowly scoped rule has this form, with the source address replaced by the real application node:
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sudo ufw allow from 10.0.0.21 to any port 11211 proto tcpOn a host using firewalld, the equivalent source-restricted rule can be expressed with a rich rule:
sudo firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="10.0.0.21" port port="11211" protocol="tcp" accept'
sudo firewall-cmd --reloadThese examples are policy illustrations; use the firewall framework actually enabled on your VPS and confirm that an existing broad rule is not taking precedence. Apply the same source restriction in the cloud firewall.
Add SASL authentication when clients support it
SASL can require a client to authenticate before issuing Memcached commands, but it is optional and must be supported by the server build and every client library that will connect. The -S option enables SASL commands, requires the binary protocol, and blocks unauthenticated command use.
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- Create a credential in the Memcached SASL database. For example:
sudo saslpasswd2 -a memcached -c cacheuser - Protect the SASL database so only the Memcached service account can read it. Check ownership and mode after creating or rotating credentials.
- Add
-Sto the service’s effective options, then restart the packaged service. - Configure the client library for binary protocol and the matching username and password.
- Test a successful authenticated connection and a deliberately unauthenticated connection. The latter should fail before granting cache commands.
SASL authenticates; it does not encrypt. Credentials and cache contents can still be observed or modified by an attacker who can intercept the private network. Keep the service on a restricted network or add a separately designed encryption layer. SASL cannot make a publicly exposed Memcached endpoint safe.
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After changing options, restart the service and check both its state and its listeners:
sudo systemctl restart memcached
systemctl status memcached
ss -ltnp
ss -lunpIn the TCP output, confirm that Memcached listens only on 127.0.0.1:11211, the intended private address, or not at all when using a Unix socket. The UDP output should contain no Memcached listener when -U 0 is active. The Memcached advisory uses equivalent socket-listing checks; ss is the usual tool on current Linux systems.
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Check the process command line or service definition if the listener differs from your file. Then review the journal:
journalctl -u memcached -b --no-pagerWhen SASL is enabled, verify that the binary and service options advertise -S and that the build is linked to the required SASL support, as described in the official SASL documentation. A configuration file containing -S is not proof that the running binary supports it.
Size memory and connections for the VPS
Cache memory
The -m option sets the item-cache memory in megabytes. Memcached itself uses additional memory for process overhead, connection structures, and allocator behavior, so the VPS needs more RAM than the numeric -m value. Values below 64 MB can still consume up to a 64 MB minimum, so a small number is not a reliable way to create a tiny footprint.
Leave headroom for the operating system, the application, monitoring, and short-lived traffic spikes. Increase the cache only after observing hit rate, eviction behavior, and the VPS’s real memory pressure. If the kernel starts swapping, reduce the cache or move the workload; swapping defeats the latency reason for using an in-memory cache.
Concurrent connections
The documented default maximum is 1,024 concurrent connections. Compare that with the application’s worker count, connection pooling, health checks, and any sidecars before changing it. Raising the limit consumes more file descriptors and memory. If the application legitimately needs a higher value, raise the service’s file-descriptor limit as part of the same change and monitor the result.
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Application behavior
- Use finite expiration times so obsolete entries do not occupy memory indefinitely.
- Handle cache misses, timeouts, and a temporarily unavailable daemon without taking down the authoritative data path.
- Use namespaced keys when multiple applications share one instance, and define a deliberate invalidation strategy for deployments.
- Do not put secrets, credentials, or data requiring durability into an unauthenticated cache.
Troubleshoot common installation and security failures
| Symptom | Likely cause | Checks and correction |
|---|---|---|
| Service starts but the application cannot connect | Wrong bind address, socket path, protocol, or firewall rule | Compare the client’s endpoint with ss -ltnp; inspect the service command line; if using a socket, check path ownership and permissions |
| Remote client times out | Memcached is bound to localhost, or one of the two firewall layers blocks the private source | Bind to the intended private address, allow only the client source on TCP 11211, and test from that source network |
| UDP still appears in listener output | -U 0 was omitted or an override replaced it |
Inspect the effective systemd options, add -U 0, restart, and rerun ss -lunp |
| Restart fails after editing configuration | Typo, unsupported option, duplicate setting, or an invalid socket directory | Read systemctl status memcached and the journal; correct the exact reported option or create the socket directory with suitable ownership |
| SASL clients receive authentication or protocol errors | Client lacks SASL or binary-protocol support, credentials are unreadable, or -S is not active in the running service |
Verify build support, database permissions, binary protocol settings, and the effective command line; then retest with a known credential |
Memory usage is higher than -m |
Daemon overhead, allocator use, connections, or the 64 MB minimum for small settings | Measure process and system memory, reduce -m if necessary, and preserve operating-system headroom |
| Cache appears empty after a reboot | Expected non-persistence | Warm the cache through normal application requests and keep source data outside Memcached |
Operational checklist for a production VPS
- Install from the operating-system package unless a documented feature or version requirement justifies a source build.
- Record the exact Memcached version, package or source origin, configuration path, and service unit.
- Bind to localhost, a specific private address, or a Unix socket; never a public wildcard address.
- Set
-U 0and verify that no UDP listener exists. - Restrict TCP
11211in both the VPS firewall and cloud security policy. - Use SASL when supported clients need an additional access-control layer, while remembering that it does not provide encryption.
- Monitor memory pressure, evictions, hit rate, connection count, restart events, and application error handling.
- Test a reboot and a service restart so socket directories, permissions, firewall rules, and client recovery are known to work.
- Plan upgrades and rollback, especially for source builds that do not inherit distribution service integration.
