puppeteer/docs/troubleshooting.md

# Troubleshooting

## Chrome headless doesn't launch

Make sure all the necessary dependencies are installed. You can run `ldd chrome | grep not` on a Linux
machine to check which dependencies are missing. The common ones are provided below.

<details>
<summary>Debian (e.g. Ubuntu) Dependencies</summary>

```
gconf-service
libasound2
libatk1.0-0
libc6
libcairo2
libcups2
libdbus-1-3
libexpat1
libfontconfig1
libgcc1
libgconf-2-4
libgdk-pixbuf2.0-0
libglib2.0-0
libgtk-3-0
libnspr4
libpango-1.0-0
libpangocairo-1.0-0
libstdc++6
libx11-6
libx11-xcb1
libxcb1
libxcomposite1
libxcursor1
libxdamage1
libxext6
libxfixes3
libxi6
libxrandr2
libxrender1
libxss1
libxtst6
ca-certificates
fonts-liberation
libappindicator1
libnss3
lsb-release
xdg-utils
wget
```
</details>

<details>
<summary>CentOS Dependencies</summary>

```
pango.x86_64
libXcomposite.x86_64
libXcursor.x86_64
libXdamage.x86_64
libXext.x86_64
libXi.x86_64
libXtst.x86_64
cups-libs.x86_64
libXScrnSaver.x86_64
libXrandr.x86_64
GConf2.x86_64
alsa-lib.x86_64
atk.x86_64
gtk3.x86_64
ipa-gothic-fonts
xorg-x11-fonts-100dpi
xorg-x11-fonts-75dpi
xorg-x11-utils
xorg-x11-fonts-cyrillic
xorg-x11-fonts-Type1
xorg-x11-fonts-misc
```
</details>

- Check out discussions:
  - [#290](https://github.com/GoogleChrome/puppeteer/issues/290) - Debian troubleshooting
  - [#391](https://github.com/GoogleChrome/puppeteer/issues/391) - CentOS troubleshooting
  - [#379](https://github.com/GoogleChrome/puppeteer/issues/379) - Alpine troubleshooting

## Chrome Headless fails due to sandbox issues

- make sure kernel version is up-to-date
- read about linux sandbox here: https://chromium.googlesource.com/chromium/src/+/master/docs/linux_suid_sandbox_development.md
- try running without the sandbox (**Note: running without the sandbox is not recommended due to security reasons!**)
```js
const browser = await puppeteer.launch({args: ['--no-sandbox', '--disable-setuid-sandbox']});
```

## Running Puppeteer in Docker

Getting headless Chrome up and running in Docker can be tricky.
The bundled Chromium that Puppeteer installs is missing the necessary
shared library dependencies.

To fix, you'll need to install the missing dependencies and the
latest Chromium package in your Dockerfile:

```
FROM node:8-slim

# See https://crbug.com/795759
RUN apt-get update && apt-get install -yq libgconf-2-4

# Install latest chrome dev package.
# Note: this installs the necessary libs to make the bundled version of Chromium that Puppeteer
# installs, work.
RUN apt-get update && apt-get install -y wget --no-install-recommends \
    && wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - \
    && sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' \
    && apt-get update \
    && apt-get install -y google-chrome-unstable \
      --no-install-recommends \
    && rm -rf /var/lib/apt/lists/* \
    && apt-get purge --auto-remove -y curl \
    && rm -rf /src/*.deb

# It's a good idea to use dumb-init to help prevent zombie chrome processes.
ADD https://github.com/Yelp/dumb-init/releases/download/v1.2.0/dumb-init_1.2.0_amd64 /usr/local/bin/dumb-init
RUN chmod +x /usr/local/bin/dumb-init

# Uncomment to skip the chromium download when installing puppeteer. If you do,
# you'll need to launch puppeteer with:
#     browser.launch({executablePath: 'google-chrome-unstable'})
# ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD true

# Install puppeteer so it's available in the container.
RUN yarn add puppeteer

# Add user so we don't need --no-sandbox.
RUN groupadd -r pptruser && useradd -r -g pptruser -G audio,video pptruser \
    && mkdir -p /home/pptruser/Downloads \
    && chown -R pptruser:pptruser /home/pptruser \
    && chown -R pptruser:pptruser /node_modules

# Run everything after as non-privileged user.
USER pptruser

ENTRYPOINT ["dumb-init", "--"]
CMD ["google-chrome-unstable"]
```

Build the container:

```bash
docker build -t puppeteer-chrome-linux .
```

Run the container by passing `node -e "<yourscript.js content as a string>` as the command:

```bash
 docker run -i --rm --cap-add=SYS_ADMIN \
   --name puppeteer-chrome puppeteer-chrome-linux \
   node -e "`cat yourscript.js`"
```

There's a full example at https://github.com/ebidel/try-puppeteer that shows
how to run this Dockerfile from a webserver running on App Engine Flex (Node).

### Running on Alpine

The [newest Chromium package](https://pkgs.alpinelinux.org/package/edge/community/x86_64/chromium) supported on Alpine is 63, which was corresponds to [Puppeteer v0.11.0](https://github.com/GoogleChrome/puppeteer/releases/tag/v0.11.0).

Example Dockerfile:

```
FROM node:9-alpine

# Installs latest Chromium (63) package.
RUN apk update && apk upgrade && \
    echo @edge http://nl.alpinelinux.org/alpine/edge/community >> /etc/apk/repositories && \
    echo @edge http://nl.alpinelinux.org/alpine/edge/main >> /etc/apk/repositories && \
    apk add --no-cache \
      chromium@edge \
      nss@edge

...

# Tell Puppeteer to skip installing Chrome. We'll be using the installed package.
ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD true

# Puppeteer v0.11.0 works with Chromium 63.
RUN yarn add puppeteer@0.11.0

# Add user so we don't need --no-sandbox.
RUN addgroup -S pptruser && adduser -S -g pptruser pptruser \
    && mkdir -p /home/pptruser/Downloads \
    && chown -R pptruser:pptruser /home/pptruser \
    && chown -R pptruser:pptruser /app

# Run everything after as non-privileged user.
USER pptruser

...
```

And when launching Chrome, be sure to use the `chromium-browser` executable:

```js
const browser = await puppeteer.launch({
  executablePath: '/usr/bin/chromium-browser'
});
```

#### Tips

By default, Docker runs a container with a `/dev/shm` shared memory space 64MB.
This is [typically too small](https://github.com/c0b/chrome-in-docker/issues/1) for Chrome
and will cause Chrome to crash when rendering large pages. To fix, run the container with
`docker run --shm-size=1gb` to increase the size of `/dev/shm`. Since Chrome 65, this is no
longer necessary. Instead, launch the browser with the `--disable-dev-shm-usage` flag:

```js
const browser = await puppeteer.launch({
  args: ['--disable-dev-shm-usage']
});
```

This will write shared memory files into `/tmp` instead of `/dev/shm`. See [crbug.com/736452](https://bugs.chromium.org/p/chromium/issues/detail?id=736452) for more details.

Seeing other weird errors when launching Chrome? Try running your container
with `docker run --cap-add=SYS_ADMIN` when developing locally. Since the Dockerfile
adds a `pptr` user as a non-privileged user, it may not have all the necessary privileges.

[dumb-init](https://github.com/Yelp/dumb-init) is worth checking out if you're 
experiencing a lot of zombies Chrome processes sticking around. There's special
treatment for processes with PID=1, which makes it hard to terminate Chrome
properly in some cases (e.g. in Docker).

## Running Puppeteer on Heroku

Running Puppeteer on Heroku requires some additional dependencies that aren't included on the Linux box that Heroku spins up for you. To add the dependencies on deploy, add the Puppeteer Heroku buildpack to the list of buildpacks for your app under Settings > Buildpacks.

The url for the buildpack is https://github.com/jontewks/puppeteer-heroku-buildpack

When you click add buildpack, simply paste that url into the input, and click save. On the next deploy, your app will also install the dependencies that Puppeteer needs to run.

If you need to render Chinese, Japanese, or Korean characters you may need to use a buildpack with additional font files like https://github.com/CoffeeAndCode/puppeteer-heroku-buildpack

There's also another [simple guide](https://timleland.com/headless-chrome-on-heroku/) from @timleland that includes a sample project: https://timleland.com/headless-chrome-on-heroku/.