Make npm phantomjs-prebuilt package compatible with alpine-based docker image.
Problem
musl-libc vs glibc
alpine uses musl-libc as its C library instead of glibc to shrink down the image size and improve performance 1.
However phantomjs doesn’t get compiled with musl-libc which cripples phantomjs-prebuilt node package inside the container. The cause was pinned down to the missing ld-linux-x86-64.so.2.
It appears there is no fix for this even after so long.
Solution
Dockerize
One approach is to Dockerize phantomjs into linux executables inside a glibc compatible base (Debian or Ubuntu):
// download phantomjs
mkdir /tmp && cd /tmp
curl -o phantomjs.tar.bz2 \
-L https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-2.1.1-linux-x86_64.tar.bz2
// untar and dockerize phantomjs
tar -jxvf phantomjs.tar.bz2
dockerize -n -o phantomjsDir -e /tmp/phantomjs-2.1.1-linux-x86_64 \
-a /bin/dash /bin/sh -a /usr/share/fonts /usr/share -a /etc/ssl /etc \
-a /etc/fonts /etc \
/tmp/phantomjs-2.1.1-linux-x86_64 /usr/bin/curl
// tar the executables but without phantomjs binaries
cd phantomjsDir
tar -zcf phantomjs.tar.gz ./lib ./lib64 ./usr/libWhich gives us a phantomjs.tar.gz with the following structure:
│── lib
│ └── x86_64-linux-gnu
│ ├── libcom_err.so.2
│ ├── libcrypto.so.1.0.0
│ ├── libcrypt.so.1
│ ├── libc.so.6
│ ├── libdl.so.2
│ ├── libexpat.so.1
│ ├── libgcc_s.so.1
│ ├── libgcrypt.so.11
│ ├── libgpg-error.so.0
│ ├── libkeyutils.so.1
│ ├── libm.so.6
│ ├── libnss_compat.so.2
│ ├── libnss_dns.so.2
│ ├── libnss_files.so.2
│ ├── libpng12.so.0
│ ├── libpthread.so.0
│ ├── libresolv.so.2
│ ├── librt.so.1
│ ├── libssl.so.1.0.0
│ └── libz.so.1
├── lib64
│ └── ld-linux-x86-64.so.2
└── usr
│ └── lib
│ └── x86_64-linux-gnu
│ ├── libasn1.so.8
│ ├── libcurl.so.4
│ ├── libffi.so.6
│ ├── libfontconfig.so.1
│ ├── libfreetype.so.6
│ ├── libgnutls.so.26
│ ├── libgssapi_krb5.so.2
│ ├── libgssapi.so.3
│ ├── libhcrypto.so.4
│ ├── libheimbase.so.1
│ ├── libheimntlm.so.0
│ ├── libhx509.so.5
│ ├── libidn.so.11
│ ├── libk5crypto.so.3
│ ├── libkrb5.so.26
│ ├── libkrb5.so.3
│ ├── libkrb5support.so.0
│ ├── liblber-2.4.so.2
│ ├── libldap_r-2.4.so.2
│ ├── libp11-kit.so.0
│ ├── libroken.so.18
│ ├── librtmp.so.0
│ ├── libsasl2.so.2
│ ├── libsqlite3.so.0
│ ├── libstdc++.so.6
│ ├── libtasn1.so.6
│ └── libwind.so.0Then mount phantomjs.tar.gz into the alpine image we are going to build.
tar -zxf phantomjs.tar.gz /phantomjs-prebuilt should now work fine in alpine-based docker containers.