Unable to use latest client file: Unable to load dynamic library '/usr/local/lib/php/extensions/amazon-elasticache-cluster-client.so'

[pauljura]

I have a Docker image for a legacy application running PHP 8.2 with the AWS Elasticache Cluster client.

When I tried rebuilding it today, it is no longer able to load the amazon-elasticache-cluster-client.so extension.

If I copy the amazon-elasticache-cluster-client.so file out of my existing container (dated March 1, 2023) my new image will run perfectly fine. But if I download and extract the latest one (file is dated Nov 11, 2023) I get the following error:

Warning: PHP Startup: Unable to load dynamic library 'amazon-elasticache-cluster-client.so' (tried: /usr/local/lib/php/extensions/no-debug-non-zts-20220829/amazon-elasticache-cluster-client.so (/usr/local/lib/php/extensions/no-debug-non-zts-20220829/amazon-elasticache-cluster-client.so: cannot open shared object file: No such file or directory), /usr/local/lib/php/extensions/no-debug-non-zts-20220829/amazon-elasticache-cluster-client.so.so (/usr/local/lib/php/extensions/no-debug-non-zts-20220829/amazon-elasticache-cluster-client.so.so: cannot open shared object file: No such file or directory)) in Unknown on line
0

To prove the only difference is the extension, I have both extension files saved side by side and I can build 2 images with literally the only difference being which file gets included. The older one works, the newer one causes an error.

# using the old file works:
COPY amazon-elasticache-cluster-client-2023-03.so /usr/local/lib/php/extensions/amazon-elasticache-cluster-client.so
# using newer file gives an error
COPY amazon-elasticache-cluster-client-2023-11.so /usr/local/lib/php/extensions/amazon-elasticache-cluster-client.so

Something has changed, maybe there is a new dependency I'm not aware of, maybe there is a thread-safe vs. non-thread-safe mixup, I don't know. But definitely the latest file does not work for me.

Ordinarily this wouldn't be a problem, I could just keep the old file and never update it. But I'm trying to migrate this legacy app from an AMD EC2 to a new ARM64 EC2, and so I'm downloading the ARM64 client, and building my image from scratch, so now I'm getting that error. And I don't have a copy of the old client that was built for ARM64 (I didn't need it before).

What can I do? Am I missing some dependency? Can I download an older version of the extension? The download page in AWS always gives me the latest.

Thanks in advance for any help.

[pauljura]

Output of running ldd with the old extension:

ldd /usr/local/lib/php/extensions/amazon-elasticache-cluster-client.so
        linux-vdso.so.1 (0x00007ffe027cc000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fd09c21b000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fd09c001000)
        libssl.so.3 => /lib/x86_64-linux-gnu/libssl.so.3 (0x00007fd09bf58000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fd09bf38000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fd09bd57000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fd09bc76000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fd09c293000)
        libcrypto.so.3 => /lib/x86_64-linux-gnu/libcrypto.so.3 (0x00007fd09b7f3000)

with the newer extension:

ldd /usr/local/lib/php/extensions/amazon-elasticache-cluster-client.so
        linux-vdso.so.1 (0x00007ffcf04e7000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f6e1dd50000)
        libcrypt.so.2 => not found
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f6e1dc71000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f6e1da57000)
        libssl.so.3 => /lib/x86_64-linux-gnu/libssl.so.3 (0x00007f6e1d9ae000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f6e1d98c000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f6e1d7ab000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f6e1ddc3000)
        libcrypto.so.3 => /lib/x86_64-linux-gnu/libcrypto.so.3 (0x00007f6e1d328000)

Looks like libcrypt.so.2 is a new dependency and is missing. Trying to figure out how to install this now...

[pauljura]

I couldn't figure out where to get the libcrypt.so.2 from so I just made the following symlink:

For AMD:
ln -s /lib/x86_64-linux-gnu/libcrypto.so.3 /lib/x86_64-linux-gnu/libcrypt.so.2

For ARM:
ln -s /lib/aarch64-linux-gnu/libcrypto.so.3 /lib/aarch64-linux-gnu/libcrypt.so.2

It seems to work. I'm not sure if this is a good thing to do, but I haven't run into any problems yet.