增加节点 docker 镜像中的观察者

Question

需要在 docker 镜像中增加观察者，因为它在 expo 发布时失败并出现错误

[11:39:08] Error: ENOSPC: System limit for number of file watchers reached, watch '/__w/mevris-client-app-products/mevris-client-app-products/node_modules/update-notifier/node_modules/camelcase'
[11:39:08]     at FSWatcher.start (internal/fs/watchers.js:165:26)
[11:39:08]     at Object.watch (fs.js:1258:11)
[11:39:08]     at NodeWatcher.watchdir (/__w/mevris-client-app-products/mevris-client-app-products/node_modules/metro/node_modules/sane/src/node_watcher.js:159:22)
[11:39:08]     at Walker.<anonymous> (/__w/mevris-client-app-products/mevris-client-app-products/node_modules/metro/node_modules/sane/src/common.js:109:31)
[11:39:08]     at Walker.emit (events.js:198:13)
[11:39:08]     at /__w/mevris-client-app-products/mevris-client-app-products/node_modules/walker/lib/walker.js:69:16
[11:39:08]     at go$readdir$cb (/__w/mevris-client-app-products/mevris-client-app-products/node_modules/@react-native-community/cli/node_modules/graceful-fs/graceful-fs.js:187:14)
[11:39:08]     at FSReqWrap.args [as oncomplete] (fs.js:140:20)

在 Dockerfile 中添加了以下几行

RUN echo "fs.inotify.max_user_instances=524288" >> /etc/sysctl.conf && sysctl -p

构建时导致此错误 sysctl: setting key "fs.inotify.max_user_watches": Read-only file system

我需要在 Github Actions 中使用那个 docker 镜像

文件

FROM node:10

RUN echo "fs.inotify.max_user_instances=524288" >> /etc/sysctl.conf
RUN echo "fs.inotify.max_user_watches=524288" >> /etc/sysctl.conf
RUN echo "fs.inotify.max_queued_events=524288" >> /etc/sysctl.conf

RUN apt-get -qq update && apt-get -qq -y install bzip2

RUN yarn global add @bluebase/cli && bluebase plugins:add @bluebase/cli-expo && bluebase plugins:add @bluebase/cli-web

RUN bluebase plugins

RUN npm i -g expo-cli

COPY entrypoint.sh /entrypoint.sh

ENTRYPOINT ["sh", "/entrypoint.sh"]

Answer 1

我在 Mac OSX（不是 docker-for-mac）上运行 Docker 时遇到了同样的问题。

基于 sysclt 设置与内核主机共享的前提，我修复了对 docker-machine (boot2docker) 执行 ssh 并更改那里的设置的问题。

$ docher-machine ssh
$ echo fs.inotify.max_user_watches=524288 | sudo tee -a /etc/sysctl.conf
$ sudo sysctl -p

Answer 2

从本期/24和本期/628

您需要增加主机上的 fs.inotify.max_user_watches 参数。例如，您可以在 /etc/sysctl.d 中创建配置文件。示例 /etc/sysctl.d/crashplan.conf 内容如下：

fs.inotify.max_user_watches = 1048576

您不能在构建时进行更改，因为它不会影响并且在构建期间也不允许您进行更改。

解决方法是避免出现此错误，在运行时在入口点中设置它。

FROM node:10.16

# set inotify and start the node application, replace yar with your command
RUN echo "#!/bin/sh \n\
echo "fs.inotify.max_user_watches before update" \n\
cat /etc/sysctl.conf\n\
echo "______________________________________________updating inotify ____________________________________" \n\
echo fs.inotify.max_user_watches=524288 | tee -a /etc/sysctl.conf && sysctl -p \n\
echo "updated value is" \n\
cat /etc/sysctl.conf | grep fs.inotify \n\
exec yarn start:dev \
" >> /usr/local/bin/entrypoint.sh

RUN chmod +x /usr/local/bin/entrypoint.sh

# EXPOSE TARGET PORT
EXPOSE 3001
ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]