linux系统在一些情况下会出现/run/systemd空间不足的问题，造成软件无法正常运行。今天入手了一个HiNet nat vps，128MB运存，安装软件提示/run/systemd空间不足的问题，于是网上找了一下解决办法。

报错详情

Setting up dnsmasq (2.76-5+deb9u2) ...

Created symlink /etc/systemd/system/multi-user.target.wants/dnsmasq.service → /lib/systemd/system/dnsmasq.service.

Failed to reload daemon: Refusing to reload, not enough space available on /run/systemd. Currently, 9.0M are free, but a safety buffer of 16.0M is enforced.

/usr/bin/deb-systemd-helper: error: systemctl preset failed on dnsmasq.service: No such file or directory

Failed to reload daemon: Refusing to reload, not enough space available on /run/systemd. Currently, 9.0M are free, but a safety buffer of 16.0M is enforced.

Failed to reload daemon: Refusing to reload, not enough space available on /run/systemd. Currently, 9.0M are free, but a safety buffer of 16.0M is enforced.

Processing triggers for systemd (232-25+deb9u8) ...

Failed to reload daemon: Refusing to reload, not enough space available on /run/systemd. Currently, 9.0M are free, but a safety buffer of 16.0M is enforced.

df -h看下空间确实不足

Filesystem Size Used Avail Use% Mounted on

udev 47M 0 47M 0% /dev

tmpfs 12M 2.4M 9.1M 21% /run

/dev/vda1 1.8G 697M 948M 43% /

tmpfs 58M 0 58M 0% /dev/shm

tmpfs 5.0M 0 5.0M 0% /run/lock

tmpfs 58M 0 58M 0% /sys/fs/cgroup

tmpfs 12M 0 12M 0% /run/user/0

解决办法

根据提示是/run/systemd空间不足，我们可以想办法给它增加一点空间即可

echo "tmpfs /run tmpfs nosuid,noexec,size=18M,nr_inodes=4096 0 0" >> /etc/fstab

也就是在/etc/fstab末尾增加一行就行了。增加之后，保存，重启，问题就解决了。